







Les tableaux de conversions 
20010503 

JeanJacques pose la question : Sur quel site est il possible de trouver tous les tableaux de conversions de mètres,kg,litre,m2,m3 Quelle est la relation entre les m^{3} et les litres 1 m^{3} = 1000 litres = 1000 kg? Claude Tardif lui répond. 





An arithmetic and a geometric sequence 
20210829 

Moti pose la question : Let {an} be an arithmetic sequence such that its 1st, 20th, and 58th terms are
consecutive terms of some geometric sequence. Find the common ratio of the
geometric sequence. Harley Weston lui répond. 





Loan payment formula 
20190224 

Kenneth pose la question :
I have a question regarding the loan payment formula shown below.
Calculating the Payment Amount per Period
The formula for calculating the payment amount is shown below.
Simple Amortization Calculation Formula
A = P X r(1 + r)n over (1 + r)n  1
where
A = payment Amount per period
P = initial Principal (loan amount)
r = interest rate per period
n = total number of payments or periods
Is this formula/calculation a condensed version of a longer calculation? I am curious to know how the (1 +r)n  1 was developed from the longer calculation. For example, r(1 + r)n may have been (r + rn)n. The n's are exponents.
I thank you for whatever helpful explanation that may be provided.
Kenneth Harley Weston lui répond. 





A geometric series 
20180313 

nathi pose la question : Hi I am really struggling with this question please help !!!!
a pohutukawa tree is 86 centimetres when it is planted. in the first year after it is planted , the tree grows 42 centimetres in height.Each year the tree grows in height by 95% of the growth of the previous year.
assume that the growth in height of the pohutukawa tree can be modelled by a geometric sequence.
A)find the height of the tree 5 years after it is planted and figure out the maximum height the pohutukawa tree is expected to reach in centimetres.
The maximum height part is not answered. Penny Nom lui répond. 





Triakis 
20160627 

Gordon pose la question : Some authorities treat "triakis" (and related terms "dyakis", "tetrakis", etc.) as attached prefixes; others treat them as separate adjectives. Thus I see one of the Catalan solids described as both "triakistetrahedron" and "triakis tetrahedron". Which usage is correct? Chris Fisher lui répond. 





An open ball is an open set? 
20160623 

Aqeel pose la question : Theorem: The open ball is an open set? Harley Weston lui répond. 





sin 2x  sin x = 0 
20160424 

lilly pose la question : sin 2x  sin x = 0 0 Penny Nom lui répond. 





A geometric progression 
20160303 

Pauline pose la question : A woman measures the height of her child at birth and at monthly intervals afterwards.The child's height increases by 5% per month. Find the number of measurements she has made before the child's height is twice what it was at birth Penny Nom lui répond. 





A geometric sequence 
20150419 

Delfina pose la question : In a geometric sequence the second term is 15 and the fifth term is 405. Find the sum of the first eight terms Penny Nom lui répond. 





1 + cot x divided by sin x + cos x 
20150115 

Torrie pose la question : I need to solve this problem in terms of Sin, but I'm having trouble.
1 + cot x divided by sin x + cos x Robert Dawson and Penny Nom lui répond. 





Find the nth term 
20141026 

Kenneth pose la question : According to the pattern of the following sequence. Find it's nth term:
3,9,27,81,243,.......... Penny Nom lui répond. 





67 cubic yards in cubic metres 
20140709 

gavin pose la question : Convert 67 cu yards into cu metres Penny Nom lui répond. 





The parameterisation of of a curve 
20140401 

Eunice pose la question : Let C be the path along the curve given by y−80=−5x2 that moves from the point (5,−45) to the point (0,80).
Find r(t) the parameterisation of C in that direction as t∈[0,5]. How am I suppose to find the parametric of both x and y?
can I let x=t, then y=5t^2+80? thanks Penny Nom lui répond. 





9,4,6,8,3,... 
20140331 

Alynna pose la question : You are given the following pattern: 9,4,6,8,3,...
Create a formula for the nth figure.
I have trouble finding the formula, I need help trying to find it. Penny Nom lui répond. 





An infinite geometric series 
20131224 

Muhammad pose la question : The sum of an infinite geometric series is 15 and the sum of their squares is 45. Find the series Penny Nom lui répond. 





How many cubic centimetres are there is a cubic meter? 
20131010 

Larry pose la question : Change 1meter(to 3rd power) to centimetre(to 3rd power).
This is a metric conversion problem Penny Nom lui répond. 





How we convert cm to mm? 
20130908 

Génesis pose la question : How we convert cm to mm? Penny Nom lui répond. 





A geometric sequence 
20130716 

Relebohile pose la question : Find the n^th term of 3,6,9,12,24,48... Penny Nom lui répond. 





A curve in 3space 
20130214 

pardeep pose la question : we have to show that the curve r(t)=(cos t)i+(sin t)j+(1cos t)k ,0<=t<=2pie;
is an ellipse by showing it to an intersection of a right circular cylinder and a plane.
i got the eqn. of the cylinder but did not get the eqn of plane. Harley Weston lui répond. 





Dropping supplies from an airplane 
20130214 

Claire pose la question : An airplane flying at an altitude of 3500 feet is dropping supplies to researchers on an island. The path of the plane is parallel to the ground at the time the supplies are released and the plane is traveling at a speed of 300 mph.
a) write the parametric equations that represent the path of the supplies
c)How long will it take for the supplies to reach the ground?
d) how far will the supplies travel horizontally before they land? Penny Nom lui répond. 





A relation on a collection of sets 
20130204 

raji pose la question : suppose R be a non empty relation on a collection of sets defined by ARB if and only if A intersection B is nullset.then.....the correct answer is R is symmetric and not transitive...my doubt is how it is symmetric Penny Nom lui répond. 





A geometric sequence 
20120610 

vicki pose la question : The sum of the first three terms of a geometric sequence of positive integers is equal to seven times the first term, and the sum of the first four terms is fortyfive. What is the first term of the sequence? Penny Nom lui répond. 





Parametric equations 2 
20120225 

Kathy pose la question : If the angle at time 0 is not 45 degrees how can you find the initial velocity? Ball thrown from height of 7 feet. Caught by receiver at height of 4 feet after traveling 90 feet down the field. Find initial velocity. You had a similar problem answered but the angle was 45 degrees so the cos and sin were equal and the equations were simpler to work with. Thank you! Harley Weston lui répond. 





A geometric sequence 
20120224 

Camille pose la question : Find x if the sequence 5,10,x+2 is geometric. Penny Nom lui répond. 





A tree growth modelled by a geometric series 
20120208 

Steph pose la question : Hi I am really struggling with this question please help !!!!
a pohutukawa tree is 86 centimetres when it is planted. in the first year after it is planted , the tree grows 42 centimetres in height.Each year the tree grows in height by 95% of the growth of the previous year.
assume that the growth in height of the pohutukawa tree can be modelled by a geometric sequence.
A)find the height of the tree 5 years after it is planted and figure out the maximum height the pohutukawa tree is expected to reach in centimetres Penny Nom lui répond. 





1 + 3 + 3^2 ...+3^(n1) = 3^n  1/2 
20120127 

Vicki pose la question : I am trying to find out how to do show how this proof was worked.
Here is the end result 1 + 3 + 3^2 ...+3^(n1) = 3^n  1/2
This equation was used to find the number of white triangles in the Sierpinski Triangle Walter Whiteley lui répond. 





Mean and Average 
20120103 

john pose la question : what is the difference between average and mean Robert Dawson lui répond. 





sin A/1+cos A + 1+cos A/sin A = 2cosec A 
20111020 

Neeraj pose la question : sin A/1+cos A + 1+cos A/sin A = 2cosec A Penny Nom lui répond. 





The dimension of the box in centimetres 
20110827 

Eliza pose la question : Find the dimension of the box in centimetres. Then find its volume in cubic centimeters.
The box is 0.7m (l) 0.4 (h) 0.2 (w) Penny Nom lui répond. 





An imaginary infinite geometric tree 
20110218 

Elise pose la question : An imaginary infinite geometric tree grows 1m the first day.
2nd day 2 branches and right angles to each other and each 0.5 m long.
3rd day two new branches at ends of each of previous days' 2 branches, again at right angles, and only .25m long each.
And so on, infinitely.
Q: Use relationships of rightangled triangles and high school level knowledge of geometric series to show
the tree height is limited to (4 + sqrt2)/3 m and width to (2(sqrt2 + 1))/3 m. Robert Dawson lui répond. 





A geometric progression 
20101215 

Abeth pose la question : find the value of x so that 2(x1), x+3, x will be a geometric progression. Penny Nom lui répond. 





The value after 30 years 
20101215 

Abeth pose la question : At the end of every year, the owners of a building which costs 2, 500, 000 pesos deducts 15% from its carrying value as estimated at the beginning of the year. find the estimated value at the end of 30 years. Penny Nom lui répond. 





A geometric progression 
20100430 

Kalyani pose la question : sum of infinite geometric progression is 9 and common ratio is 1/10
then sum up to 8 terms is? Chris Fisher lui répond. 





A geometric sequence 
20100413 

glen pose la question : A geometric sequence has a first term of 0.1024, a second term of 0.256,
and a middle term of 156.25. how many terms are there in the whole
sequence?
i know that r=2.5 but i dont know how to find how many terms there are. Penny Nom lui répond. 





Metric prefixes 
20100316 

ali pose la question : How do you convert zectometres to yoctometres Robert Dawson lui répond. 





The integral of X^3/the square root of 1x^2 dx 
20100307 

William pose la question : The integral of X^3/the square root of 1x^2 dx. Harley Weston lui répond. 





A geometric sequence 
20100222 

Kelsey pose la question : _, 2, _, _, 250, _
i don't know how to fill in the missing terms Penny Nom lui répond. 





An infinite geometric series 
20090518 

terri pose la question : find the sum of the infinite geometric series
14 7 +7/2 7/4 +.....
A. 7007/13 B. 2002 C. 28/3 D.5005/7 Stephen La Rocque lui répond. 





A geometric progression 
20090516 

sweta pose la question : find the ratio of GP if the first term is 1 and the sum of third and fifth term is 90. Penny Nom lui répond. 





Milliliters of oxygen in your lungs 
20090320 

Leandrea pose la question : if you have 3 liters of air in your lungs and 2/10 of that is oxygen, how many milliliters of oxygen are in your lungs? Penny Nom lui répond. 





A trig limit 
20090205 

Kathy pose la question : Hi! I was just wondering how to do this question:
lim 1cos2x/xsinx as x approaches 0
Thanks,
Kathy Penny Nom lui répond. 





Trig identities 
20090105 

Michael pose la question : 1) Determine if the following is an identity. If it is, prove it, If it isn't state it.
tan x + cot x = sec x * csc x
and
1  (cos^2) x = 1+ (cot^2) x Robert Dawson and Harley Weston lui répond. 





The volume of a pipe 
20081210 

Walter pose la question : What is the volume of a pipe 7.92 inches inside diameter and 22 km. long in cubic feet of water Robert Dawson and Harley Weston lui répond. 





A wine decanter 
20081210 

Suzanne pose la question : I am trying to buy a wine decanter for my dad for Christmas. One big
problem I am having shopping online is finding the right size. Wine is sold
by metric ml, with a standard bottle holding 750ml of wine. Decanters are
measured by oz, and the sizes are all over the place, with one site alone
having sizes 25oz, 26 1/2oz, 50oz, 59 1/8oz, and 68oz.
Can you help me with metric conversions so I can figure out how much wine
these decanters hold? Like everybody else, I need this as soon as possible
so I can get it shipped in time for Christmas. (I'm disabled & don't drive, so
online shopping is my only way to get gifts.)
Thanks for your help!
Suzanne Chris Fisher and Robert Dawson lui répond. 





A geometric construction 
20081017 

M pose la question : Given any 3 parallel lines on a plane, how to construct an equilateral triangle with each vertex on each line? Chris Fisher lui répond. 





0.151515...=15/99 
20080908 

Emma pose la question : This week, my Algebra teacher told us about the pattern between infinitely repeating
decimals and their corresponding fractions.
(ex. .2222222...= 2/9, .151515...=15/99, 456456456...=456/999, etc.)
I was just wondering the reason why this pattern occurs.
Is there a certain element that causes this pattern to occur?
Thanks
Emma Penny Nom lui répond. 





How many litres of rain is this? 
20080901 

Todd pose la question : If i have 10mls of rain over one square metre how many litres would I
and how do I do the maths for this? Penny Nom lui répond. 





Converting centimetres to metres 
20080821 

walter pose la question : how do you convert the smaller unit to a decimal of the larger unit and then solve
17 m  130 cm Penny Nom lui répond. 





How many decimeters are in a meter? 
20080811 

Julia pose la question : How many decimeters are in a meter? Penny Nom lui répond. 





Proofs 
20080726 

Taylor pose la question : when doing a proof, how do i figure out the steps in which i find the statements? i find the reasons pretty easily but i do not understand how to get the proving part. that would be great if you can help me! Thanks Victoria West lui répond. 





Demographics 
20080725 

shahrukh pose la question : Each year for 10 years ,the population of a city increased by 5% of its value in the previous year.
If the initial population was 200 000 ,what was the population after 10 years ?? Penny Nom lui répond. 





Geometric shapes that are the same 
20080609 

tia pose la question : what is the name used for shapes that are exactly the same? Harley Weston lui répond. 





Geometric sequences 
20080608 

Rita pose la question : A geometric sequence is given. Find the common ratio and write out the first four terms.
(1) {(5)^n}
(2) {(2^n)/(3^(n  1)} Penny Nom lui répond. 





How much seed do I need per plot? 
20080513 

Jaye pose la question : The plot size is 5 m X 2 m. The seeding rate is 12Kg/ha. How much seed do I need per plot? I have failed to get a proper answer.
Thank you. Penny Nom lui répond. 





Converting metric density 
20080428 

Hilary pose la question : 10g/100ml=?g/?l
52g/100ml=?g/?l
65g/100ml=?g/?l
100g/100ml=?g/?l
137g/100ml=?g/?l
0.15g/100ml=?g/?l Penny Nom lui répond. 





The isoperimetric inequality 
20080421 

Dutch pose la question : I'm searching for the proof that the sphere has the smallest volume of any figure and maximizes the volume of any figure. Chris Fisher lui répond. 





A parallel line to a given line 
20080412 

john pose la question : A parallel line to a given line through a given point not on the a given line Harley Weston lui répond. 





The integral of dx / (4x^2  25)^3/2 
20080401 

Meghan pose la question : I have a question from the trigonometric substitution of my calculus course.
integral of dx / (4x^2  25)^3/2 Harley Weston lui répond. 





Parametric equations 
20080305 

kumi pose la question : I have made a picture of a football pass 45 degrees with 30yds and height of 7ft and 4ft. But I am just stuck there. I have stared at the worksheet for soo long. I have no idea how to solve this, and I don't even know where this is going (I don't understand how parametric equations work). Can you help me with this problem?
1.The quarterback of a football team releases a pass at a height, h, of 7ft above the playing field, and the football is caught by a reciever at a height of 4ft, 30yds directly downfield. The pass is released at an angle of 45 degrees with the horizontal with an initial velocity of vo. The parametric equations for the position of the football at time t are given, in general, by x(t)=(vo cosθ)t and y=h+(vo sinθ)t16t^2.
a. find the initial velocity of the football when it is released
b. write the specific set of parametric equations for the path of the football
c.use a graphing calculator to graph the path of the football and approximate its maximum height
d. find the time the reciever has to position himself after the quarterback releases the football Harley Weston lui répond. 





150 decimeters is how many centimeters 
20080229 

gayle pose la question : 150 decimeters is how many centimeters Penny Nom lui répond. 





How many meters/kilometers/millimeters would that be? 
20080117 

chantal pose la question : if a ocean/lake/river is 250meters from where you are, how long would it take to get to shore? how many meters/kilometers/millimeters would that be? Penny Nom lui répond. 





x=sint, y=cos2t 
20080114 

Art pose la question : How do i transform x=sint y=cos2t into a function in terms of x and y Harley Weston lui répond. 





How many centimeters equal one meter? 
20071115 

Sherrie pose la question : How many centimeters equal one meter? Penny Nom lui répond. 





A particle moves in the xyplane 
20071112 

Russell pose la question : A particle moves in the xyplane with
X = 2t^3  12t^2 + 18t
Y = 3t^4  28t^3 + 72t^2
find an equation of the line tangent to the given curve at t_0_ = 1
note: t_0_ is t subscript 0 Harley Weston lui répond. 





Converting millimeteres to inches 
20071027 

Alison pose la question : I am hoping to buy a cabinet, the measurements are 1120mm x 560mm, what is that in feet & inches. Penny Nom lui répond. 





The nth term 
20071018 

shannon pose la question : Ok , what i am having problems with is the nth term. I get how the numbers come together, but i am having trouble with finding the nth term. Penny Nom lui répond. 





Finding a geometric mean and taking its antilog 
20070827 

Jack pose la question : Would like to know the basic geometric mean calculation. Also how would I take the antilog from this number? Stephen La Rocque lui répond. 





Applications of sequences and series 
20070827 

Trish pose la question : I'm a grade 12 learner working on a math project based on sequences and series. I'd like to know the different types of sequences and series such as fibonacci, fourier, farey, etc.
I've already used the Fibonacci Sequence and Harmonic Series
and need two more.
The simpler the sequence or series type the better.
I'd also like to know in which nonmathematical areas use sequences and series
and how.
Areas such as engineering or science. Penny Nom lui répond. 





Parametric equations 
20070822 

will pose la question : Graph and make a sketch of x = ysquared  6y + 11 in parametric mode (hint: you need to come up with 2 parametric equations).
i have already figured out that the cartesian form of the parametrics will be y = +/ sqroot(x2) + 3, but i do not know how to produce 2 parametric equations from this. Penny Nom lui répond. 





Which is more, 1.25 grams or 4.7 ml? 
20070822 

jenni pose la question : Which is more? 1.25 grams or 4.7 ml Penny Nom lui répond. 





Isoperimetric area comparison 
20070617 

michael pose la question : An equilateral triangle and a regular hexagon have equal perimeters. If the area of the triangle 10, what is the area of the hexagon? Stephen La Rocque lui répond. 





A sequence of circles 
20070611 

Ann pose la question : Please help with solving the following problem!!!
A circle is inscribed in an equilateral triangle with a side of length 2.
Three circles are drawn externally tangent to this circle and internally
tangent to 2 sides of the triangle. 3 more circles are drawn externally
tantgent to these circles and internally tangent to 2 sides of the triangle. if
this process continued forever, what would be the sum of the areas of all the
circle? the answer 1 parent came up with was Pie over 2, but we don't
know how he did it. Can you please show the work or explain the answer to
this problem?
Thank you
Ann
p s my daughter is in 9th grade math. Steve La Rocque, Chris Fisher and Penny Nom lui répond. 





Converting mass and volume of water 
20070510 

Shian pose la question : Hello please help, I just can't seem to get the convertion thing and my mom tried to help but I still don't get it. How many grams does 1 milliliter of water weight? I was told 1g. How many grams does 0.1 liter of water weight? I was told 0.1g. Can you tell me if the answers given are correct with an explaination that I can understand? Thank you. Stephen La Rocque lui répond. 





Converting from mm to cm 
20070508 

Amanda pose la question : How do you convert mm into centimeters? Gabriel Potter and Steve La Rocque lui répond. 





Arithmetic means and geometric means 
20070404 

Dani pose la question : Hi!
I was just wondering why the arithmetic mean of sets of numbers is larger than the mean proportional of the same numbers?
Thanks!
Dani Haley Ess lui répond. 





A geometric series 
20070403 

jessica pose la question : If a geometric series includes 5418+62 as its fifteenth through eighteenth terms, find the sum of the second through the fifth term, inclusive. Stephen La Rocque lui répond. 





The nth term 
20070213 

Sarah pose la question : I am having difficulty in finding the nth term for 7,49,343,2401. Could you please help me in finding the correct answer? Stephen La Rocque lui répond. 





Find the total distance the swing traveled before it stopped. 
20061217 

Leah pose la question : Rebecca's little sister liked for her to push her in the swing at the park. The other day Rebecca pulled the swing back and let it go. She would have kept pushing, but she suddenly saw a friend at the other end of the park. The swing traveled a total distance of 10 feet before heading back the other way. Each swing afterwards was only 80% as long as the previous one. Find the total distance the swing traveled before it stopped. Penny Nom lui répond. 





A geometric sequence 
20061128 

Jillian pose la question : Find x so that 2x, x + 5, x  7 are consecutive terms of a geometric sequence. Stephen La Rocque lui répond. 





The history of the meter 
20061023 

Caitlyn pose la question : i'm an 8th grade student and i have a lab report due and i really need to find out more about the history of the meter. Stephen La Rocque lui répond. 





how many ounces are in 750 cc's. 
20061014 

Not a teacher pose la question : how many ounces are in 750 cc's. Stephen La Rocque lui répond. 





Metric conversion 
20061008 

Eve pose la question : 45.6 microliter to megaliter? Stephen La Rocque lui répond. 





Metric Conversions 
20060902 

Patricia pose la question : I have a new difficulty, metric conversion when it involves the prefixes. Some problems I need help with are: Stephen La Rocque lui répond. 





Converting sq ft to sq meters 
20060803 

JB pose la question : I would like to convert 2700 square feet into square meters. Penny Nom lui répond. 





Volume of rainfall 
20060718 

Randy pose la question : Calculate the amount (in gallons)of rainfall .98 inches will put over an area of 3.76 acres. Stephen La Rocque lui répond. 





Ounces of water to grams 
20060716 

Liza pose la question : How many grams is in 10 ounces? I'm asking this question because i just bought a sea monkey and it says add 10 ounces of water and I don't know what that means. I have asked my parents but neither of them know. Stephen La Rocque lui répond. 





Isoperimetric quotients 
20060707 

Jessica pose la question : How do you work out an algebraic equation for the IQ of an isosceles triangle. Penny Nom lui répond. 





Geometric sequence and basic functions (graphs) 
20060420 

Marlene pose la question : Which of the basic functions is related to the geometric sequence:
Linear, Quadratic, Rational, or Exponential?
Can you give me an example of how it would be used in normal life? Stephen La Rocque lui répond. 





Arithmetic and Geometric Sequences 
20060419 

Skye pose la question : If the 1st, 4th, and 8th terms of an arithmetic sequence are consecutive terms in a geometric sequence, find the common ratio of the geometric sequence. Stephen La Rocque lui répond. 





Sum of a Geometric Sequence 
20060411 

Andre pose la question : In a particular geometric sequence, U3=3.6 and U10=12.9. Find S16 and S17. Stephen La Rocque lui répond. 





A trig identity 
20060328 

Iqbal pose la question : Could you please prove,
[tan(x)sin(x)]/sin^{3}(x)=sec(x)/[1+cos(x)]
Stephen La Rocque lui répond. 





What is the height of the pot? 
20060310 

Michelle pose la question : If a pot is 11 inches in diameter and holds 5.8 litres what is the height of the pot?  assuming it is a cylinder. Stephen La Rocque lui répond. 





the size of a lot is 300 sqm, what is the square feet conversion? 
20060211 

JC pose la question : the size of a lot is 300 sqm, what is the square feet conversion? Penny Nom lui répond. 





The Isoperimetric Quotient 
20060207 

Ceri pose la question : I am studying Isoperimetric Quotient as part of my mathematics course and have been told that the only shape with an I.Q of 1 is the circle but when I work out the I.Q of a million sided regular polygon, the answer always comes out as 1. My teacher insists it is the just the calculator rounding things up, but I have tried loads of calculators and it always comes out as 1. Can you solve my conundrum? Penny Nom lui répond. 





A trigonometric identity 
20060122 

Sarfaraz pose la question : Prove the following trigonometric identity.
sin^{2}x = tan^{2}x/(1+tan^{2}x) Penny Nom lui répond. 





How many millimeters are in 12 feet? 
20060106 

Hunter pose la question : How many millimeters are in 12 feet? Penny Nom lui répond. 





Milliliters to grams 
20051229 

Kaitlyn pose la question : If I'm using baking soda, how do I convert milliliters to grams? Harley Weston lui répond. 





how do you convert ml to oz? 
20051205 

Sara pose la question : how do you convert ml to oz? Penny Nom lui répond. 





what is 5'7 
20051126 

A student pose la question : what is 5'7" inches in cm? Harley Weston lui répond. 





An isosceles triangle 
20051114 

Chris pose la question : PX and QY are attitudes of acute triangle PQR, and Z is the midpoint of PQ. Can you write a proof that triangle XYZ is isosceles? Chri Fisher lui répond. 





Inches and millimeters 
20050930 

A student pose la question : how many inches are there in mm? For example 30x40 mm = how many inches. Penny Nom lui répond. 





Metric conversion 
20050901 

Donna pose la question : I know there is an equation to figuring out, for example. .5526 km = _______ mm Penny Nom lui répond. 





A geometric sequence 
20050621 

A student pose la question :
The first three terms of a geometric series are 3(q+5), 3(q+3), (q+7) respectively.
Calulate the value of q. Penny Nom lui répond. 





Centimeters, millimeters and milliliters 
20050419 

A student pose la question : How many milliliters in a centimeter? Penny Nom lui répond. 





Biodiesel 
20050308 

William pose la question : My son is doing an demonstration for science class about how to make biodiesel. we are having problems with the conversion. for instance we think there are approx 190 liters in 50 gallons. Is this correct? Also if you needed 3.5 grams of lye per liter, would that be 662g of lye. Penny Nom lui répond. 





Conversion of a recipe 
20050206 

Peg pose la question :
A Hungarian friend gave me an old, old family recipe and it calls for:
20 dg. sugar
15 dg. filbert
I can't find a conversion table anywhere that explains how to get ounces from "dg." Do you know what the equivalent would be in ounces of dry measurement?
Harley Weston lui répond. 





A geometric proof 
20041211 

Hanna pose la question : Given: ABCD is a quadrilateral;
Prove: ABCD is a parallelogram Penny Nom lui répond. 





Geometric sequence 
20041204 

Lesa pose la question : Find a formula for the geometric sequence: (√3  √2), (4  √6), (6√3  2√2), … Penny Nom lui répond. 





Cubic meters 
20040831 

Brad pose la question : I have a 10' x 10' x 12" area & need to find the cubic meters, how do I do this? Penny Nom lui répond. 





A geometric sequence 
20040413 

Michael pose la question : In a geometric series, the sum of the 2nd and 3rd terms is 60, and the sum of the 3rd and 4th terms is 240. Find the sum of the first 7 terms. Penny Nom lui répond. 





A metric prefix table 
20040307 

April pose la question : Can you tell me what the scale is for nano, micro, mega, kilo, etc.... I know that mega is 10 to the sixth power but I can't remember the other ones. Penny Nom lui répond. 





A worm crawling home 
20040218 

Cindy pose la question : A worm is crawling to his home which is one meter away. The longer he crawls the weaker he gets and the less he can crawl the next day. If he crawls within 1/3000 of a meter of his home, he will find food. He must eat within twelve days. The first day he crawls 1/2 meter. The second day he crawls 1/4 meter. The third day he crawls 1/8 of meter. This pattern continues for twelve days. Make a Chart that shows the distance he has covered at the end of each day and the total he has covered at the end of each day. Does he make it to the Food in time? Penny Nom lui répond. 





Geometric sequences 
20040203 

Alan pose la question : hello, I am a junior in precalculus. we started working on geometric sequences today, it makes perfect sense on how it works. but why is it called that? if you could send me an answer to why geometric sequences have that name, I would be much appreciative. Chris Fisher lui répond. 





Liters in a pool 
20030805 

A parent pose la question : I need to know how many litres in a 12 foot diameter, 3 foot deep pool? Any help much appreciated as I need to add the correct amount of chemicals Penny Nom lui répond. 





Volume of water in a pool 
20030706 

An other pose la question : How many litres of water are in a pool that is 16 feet in diameter and 35 inches deep? Penny Nom lui répond. 





An inch and a millimeter 
20030621 

Greg pose la question : The conversion factor for inches to millimeters 25.4 It strikes me as very odd that it's not some infinite decimal. I could understand this if one system was derived from the other but as I understand it they were derived independently. Is the conversion 25.4 or 25.4000XXXXXXX? If it's just 25.4 then how did that happen? Harley Weston lui répond. 





The metric and Imperial systems 
20030608 

Ashlee pose la question : i am a year 8 student, and i am doing my Maths talent quest on the Metric and Imperial number system.
i was wondering, where did the 2 systems orginate and if possible, a little bit or information.
I also need to know the conversions of ounce, foot, mile..etc..from imperial to metric. Penny Nom lui répond. 





Millimeters to inches 
20030528 

Brian pose la question : I am a music instructor just trying to get a horn repaired. I have been trying to get replacement pearls for a keyboard of a horn. The mechanic needs the measurement in inches. The calibers say that the size is .115 mm can you tell me what that is in inches, I tried your formula of 2.54 mm per inch but this is a smaller size and I cannot seem to figure it out. Penny Nom lui répond. 





8 faces, 12 vertices, and 18 edges 
20030422 

Thomas pose la question : I would like to know the proper name for this geometrical solid. It has 8 faces, 12 vertices, and 18 edges? Penny Nom lui répond. 





______cm=0.048km 
20030227 

Antonette pose la question : ______cm=0.048km Penny Nom lui répond. 





Millilitres and millimeters 
20030209 

Iwan pose la question : I was just wondering whether a millilitre was equal to a millimetre, if not, what is there difference. Penny Nom lui répond. 





Milliliters 
20030204 

James pose la question : What is a milliliter? Penny Nom lui répond. 





A bouncing ball 
20021214 

Eman pose la question :
Q : When a childís ball is dropped from a height h metres on to a hard, flat floor, it rebounds to a height of 3/5h metres. The ball is dropped initially from a height of 1.2m.  Find the maximum height to which the ball rises after two bounces.
 Find the total distance that the ball has traveled when it hits the floor for the tenth time.
 Assuming that the ball continues to bounce in the same way indefinitely, find the total distance that the ball travels.
Penny Nom lui répond. 





A geometric sequence 
20021202 

Wanda pose la question : the fifth term of a geometric sequence is 5/16. the common ratio is 1/2. What are the first four terms of the sequence. Penny Nom lui répond. 





Kilometers to miles 
20021009 

A student pose la question : how many miles are in 16 kilometers? Leeanne Boehm lui répond. 





A million sheets of 30 cm long paper 
20020915 

Jennifer pose la question : if you put a million sheets of 30 cm long paper end to end, how many kilometer long would the paper be from begining to end? Penny Nom lui répond. 





Ounces and cubic centimeters 
20020530 

Martin pose la question : How many ounces are in 600cc of liquid? Penny Nom lui répond. 





A trigonometric identity 
20020322 

Debby pose la question : I am stuck on a problem and wondering if you can help?? It is: Prove the following: sec^{2}(X)+csc^{2}(X) = sec^{2}(X)csc^{2}(X) Harley Weston lui répond. 





My 1978 Chevy has a 350 cubic inch engine 
20020311 

Sharon pose la question : If my 1978 Chevy has a 350 cubic inch engine, about what size engine would that be in liter? Penny Nom lui répond. 





Miles and kilometers 
20020122 

Dennis pose la question : I'm in the middle of purchasng a vehicle and it was built in Canada. Therefore it is in kilometers and not in miles. I forgot how many kilometers are in a mile. It registers as 183,049 kilometers. Penny Nom and Judi McDonald lui répond. 





My salary is doubled everyday for 30 days 
20020117 

Kanishk pose la question : I recieve 1 penny the 1st day, 2 pennies the 2nd day, and my salary is doubled everyday for 30 days. How much money will I have by the end of the 30 day time period? (Is there a way of solving this problem without a chart?) Penny Nom lui répond. 





Isoperimetric quotients 
20020102 

A student pose la question : I'm stuck on my GCSE Maths coursework, what do isoperimetric quotients measure? Penny Nom lui répond. 





Metric units 
20011025 

Kelly pose la question : i am helping my kids out with school work and don't remember meters,centimeters decimeters and all those. We have to change meters into cm.....and so on..........is there a place on the web to look for some kind of help in these questions Penny Nom lui répond. 





A geometric series 
20011024 

Tashalee pose la question : The sum of the first 3 terms of a geometric series is 13. The sum of their reciprocal is 13/9. how do you find the first three terms? Penny Nom lui répond. 





The average of two polygons 
20011023 

Irene pose la question : How can I prove that the average of two polygons will give me another one? Walter Whiteley lui répond. 





Milliters and grams 
20010920 

Bettyjo pose la question : 500 ml is what in grams Pnny Nom lui répond. 





Symmetry 
20010215 

Sonam pose la question : What is symmetry? Who invented symmetry? what are the different kinds of symmetry? Penny Nom lui répond. 





An order relation 
20010212 

Amy pose la question : What is an order relation? Claude Tardif lui répond. 





Geometric and arithmetic sequences 
20010126 

Garry pose la question : what are the equations for geometric and arithmetic sequences? also, what are the equations for finding the sums of those series? Leeanne Boehm and Penny Nom lui répond. 





cot(arcsin 3/5) 
20010107 

Jason pose la question : Find value. Assume that all angles are in Quadrant 1. cot(arcsin 3/5) Harley Weston lui répond. 





Power series representations 
20001127 

Grace pose la question : Is there a systematic way of finding a power series representation of a function? I understand that you have to manipulate the function so that it is of the form 1/(1x), but beyond that I am lost. Harley Weston lui répond. 





Comparing an integral and a sum 
20001121 

Douglas Norberg pose la question : A fellow teacher asked me about a problem she wanted to give to her students. It involved whether to take a million dollars or a penny doubled a number of times. I was able to determine the number must have been .01 * 2^{30} which is about $10 million and a lot more than $1 million. To check that I was right I used a spreadsheet and did a Riemann sum. When I finished I reasoned that I had done the task in several steps and I could have done it in 1 step. Thus I integrated .01 * 2^{x} from 0 through 30 but the number I got was $15,490,820.0324. Why the difference? Harley Weston lui répond. 





Infinite Geometric Series 
20001110 

Sam Carter pose la question : I ran into a problem when studying how to find the sum of an infinite geometric series. My math book attempts to explain the concept by giving formulas involving sigma and r, but it does not really explain how to go about finding the sum of an infinite geometric series. If you could either help me with this or point me in the direction of an informative website that could help me, I'd appreciate it. Harley Weston lui répond. 





A cycloid in Cartesian form 
20000920 

Billy pose la question : The parametric equation of cycloid is given: x=r(tsint) y=r(1cost) How to eliminate t? Harley Weston lui répond. 





Euclidean distance 
20000906 

Velma ZahirovicHerbert pose la question : If d(x,y) is euclidean distance between x and y Prove that d(x,y)>=0 if d(x,y)=0 than x=y and d(x,y)=d(y,x) Paul Betts lui répond. 





Geometric sequences 
20000411 

Jodie pose la question : I am in a grade ten principles class and was taught how to do geometric sequences and series but no one in my class understood what we were taught. Our teacher is one of few to use the new curriculum which used to be the grade twelve curriculum. Could you please explain to me how to do geometric sequences and how to find the different terms and sums. Thank you very much! Harley Weston lui répond. 





History of a meter 
20000407 

Jarod Fischer pose la question : The length of a meter has been determined in three different ways. The first and original way was determined in 1798. The second way was determined in 1960. The third and current way was determined in 1983. What were the three ways and why were the first two abandoned? Harley Weston lui répond. 





How many grams are in 1 ounce? 
20000404 

Kathy G pose la question : How many grams are in 1 ounce? Penny Nom lui répond. 





Symmetric Primes 
20000401 

Marlene Moore pose la question : Hi...Im in 9th grade and am having a hard time figuring out symmetric primes. Heres the problem: Find two pairs of symmetric primes of 20. Symmetric primes of 15? Claude Tardif lui répond. 





Geometrical solids 
20000315 

Sarah pose la question :
 What geometrical solid has 8 edges and 5 vertices?
 What geometrical solid has 12 edges that are all the same length?
Walter Whiteley lui répond. 





The isoperimetric theorem 
20000224 

Raj Bobal pose la question : How can you prove Mathematically that the maximum area enclosed by a given length is a circle? Chris Fisher lui répond. 





Pyramids and prisms 
20000118 

Tyler pose la question : What's the definition of a Triangular Prism and a Triangular pyramid. Penny Nom lui répond. 





Proving a trigonometric identitiy 
19991217 

Ryan pose la question : I need to figure out how to prove that sec^{2}x + csc^{2}x = sec^{2}x csc^{2}x. I am not sure where to start out with it and whether I should use reciprocal, quotient, or pythagorean. Penny Nom lui répond. 





Cubic meters to gallons 
19991209 

Chris Compton pose la question : I am trying to convert cubic meters to gallons. Do you have the conversion formula? The problem I am trying to solve is: 59.62 cubic meters to gallons. Harley Weston lui répond.






sin x = x/10 
19991007 

Amandeep Grover pose la question : Solve the equation sin x = x/10 Harley Weston lui répond. 





A Trigonometry Question 
19990828 

Diane Simms pose la question : My question is can the following be factored. I am a teacher who needs the factors to this right away. 2 Sin^{2}X + 2 SinX CosX  1= 0 Harley Weston lui répond. 





Parametric Equations 
19990806 

Nicholas Lawton pose la question : Show that an equation of the normal to the curve with parametric equations x=ct y=c/t t not equal to 0, at the point (cp, c/p) is : yc/p=xp^2cp^3 Harley Weston lui répond. 





Unit conversions 
19990420 

Deanna pose la question : My question has to do with unit conversions with English and metric systems. I need to know how to use conversion factors with powers of 10. Which way do i move my decimal point. ex. .48kl to liters. Thank you. Jack LeSage lui répond. 





Ounces and milliliters 
19990417 

Tony Rizzi pose la question : I'm mixing a formula of: 48 oz distilled water. 15 grams of Hydroxy Ethyl Cellulose GR (powder) 30 grams of Hydroxy Ethyl Cellulose MR (powder) 200 grams of Barium Sulfate (powder) 1000 grams of Calcium Hydroxide (powder) After mixing, I need to estimate the amount of each ingredient that fits in a 3ml syringe. And how many syringes I can fill? Harley weston lui répond. 





Dotted graph paper 
19990408 

Bridget Winward pose la question : A teacher at our school is trying to locate dotted graph paper online or in print. His class would like to make three dimensional, geometerical drawings. Please let us know if you have a good source. Jack LeSage lui répond. 





Converting Metric Measurements 
19990408 

Rick pose la question : Do you have any simple explanations for converting Metric measurements to other Metric measurements?? What helpful hints do you also have for a 5th Grader... Penny Nom lui répond. 





Metric Conversion 
19990307 

TDestra pose la question : Please help to answer this question: Is a cubic centimeter equivalent to milligrams or milliliters, and how many? Also, is it a liquid measure? Penny Nom lui répond. 





Converting mm's to inches 
19990222 

Paul White pose la question : It has been a long time since high school and I do not remember how to convert mm to inches. Could you please tell me what this would convert to in inches? 210 X 254 mm. Chris Fisher lui répond. 





A trig limit 
19981114 

Amy Atwell pose la question : what is the limit of of tanx / x + sin x as x approaches 0 Harley Weston lui répond. 





Two sides and a bisectrix. 
19981111 

Victor Grinshtein pose la question : I am looking for someone who can tell me how to construct a triangle by 2 sides and a bisectrix using a compass and a ruler. Chris Fisher lui répond. 





Centimetres 
19981111 

Vicky Caldwell pose la question : I work in Carpet Manufacturing and I need to know how to figure the calculation for a roll of carpet in centimeters. For example: a 12 x 100 roll of carpet equals 133.34 square yards, which is 100 linear ft. and 1,200 square foot. Can you please tell me how I would figure to get CENTIMETERS??????? Jack LeSage lui répond. 





The Left Side of a Parabola. 
19981020 

Shay pose la question : Find the parametrized equation for the left half of the parabola with the equation: Y=x^24x+3 Chris Fisher lui répond. 





Nickles on the Highway 
19980922 

Ronnie Mac Donald pose la question : How many nickels would it take to cover 226km of highway,each nickel is 2cm in diameter? Penny Nom lui répond. 





A Pattern 
19980914 

Krystin pose la question : Question: 1=1x1 1+2+1=2x2 1+2+3+2+1=3x3 draw a series of diagrams to illustrate the above pattern Penny Nom lui répond. 





Sequences and series 
19980527 

Michael Le Francois pose la question : The sum of the first ten terms of an arithmetic series is 100 and the first term is 1. Find the 10th term. The common ratio in a certain geometric sequence is r=0.2 and the sum of the first four terms is 1248 find the first term. Penny Nom lui répond. 





A Trigonometric Limit 
19970918 

Brian Ray pose la question : What is the limit, as x approaches 0, or tan^23x/x^2? (read, tan squared 3x over...)? Harley Weston lui répond. 

