48 articles trouvés pour ce sujet.
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A locus of points |
2018-09-03 |
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Ericka pose la question :
Find the locus of points three times as far from (0,4) as from (2,0)
Penny Nom lui répond. |
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The product of the coordinates of a point on a line |
2018-01-17 |
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Sophia pose la question :
For any point on line l, the product of the x-coordinate and the y-coordinate is less than or equal to zero , what is the answer?
Penny Nom lui répond. |
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Can you construct a regular 21-gon? |
2016-03-08 |
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Peter pose la question :
hi, i know that if i use a compass to draw a circle, i can use the same setting to mark 6 intervals along the circle circumference, how would i go about marking out 21 equally spaced points around the circumference?
if there an online calculator i can us, or some other interesting trick?
tia
peter
Robert Dawson lui répond. |
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A metal gate |
2016-02-06 |
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Carl pose la question :
I am a welder and I build gates. I have to put holes in a rail and then bend the rail
in a curve. The problem is that the holes in the curved rail must line up with holes
in the other straight rails. How do I calculate where to put the holes in the rail
before I bend it? I will send a drawing if necessary.
Harley Weston lui répond. |
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The midpoints of the sides of a quadrilateral |
2016-02-05 |
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Andrea pose la question :
The segments, joining, in order the midpoints of consecutive sides of a quadrilateral form a parallelogram.
Penny Nom lui répond. |
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A circle through 3 points |
2014-12-04 |
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priyanka pose la question :
Find the equation of a circle passing through the origin and intercept on axes are a and b.
Penny Nom lui répond. |
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Three collinear points |
2014-08-28 |
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jhanavi pose la question :
p,q,r are three collinear points.p and q are(3,4) and (7,7) respectively and PR is equal to 10 units.find coordinates of R
Penny Nom lui répond. |
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A circle through three points |
2014-02-22 |
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Mohammad pose la question :
Find the equation of circle passing through the origin and the points (a,b) and (b,a).
Find the length of chords that it cuts off from the axes.
Chris Fisher lui répond. |
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Intersection points and diagonals |
2013-09-11 |
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Kenneth pose la question :
I was wondering, is there a relationship between the number of sides of a regular n-gon and the number of times its diagonals intersect?
Ie:
4 sides=1 intersect (center, diagonals form an 'X' )
5 sides=5 intersects (diagonals form a star)
6 sides=13 intersects
And so on.
Chris Fisher lui répond. |
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Percent and percentage point |
2013-07-19 |
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Kenneth pose la question :
Hello:
Does 0.01 represent both one percentage point and one percent in decimal form?
What is, for example, 2/100 of one percentage point, and what is 2/100 of one percent?
Are the answers the same.
I thank you for your assistance.
Penny Nom lui répond. |
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Points of intersection |
2013-05-02 |
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Bianca pose la question :
Find the sets of values of k for which the line y=kx-4 intersects the curve y=x^2-2x at two distinct points.
Penny Nom lui répond. |
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Is a line lying in a plane an open or a closed region? |
2013-02-13 |
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pardeep pose la question :
please help with this question on the open and closed intervals ::
Is a line lying in a plane an open or a closed region? my teacher says it is a closed region reasoning out that it contains all it boundary points. please help how is it so?
Harley Weston lui répond. |
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Points per quarter |
2012-05-14 |
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debbie pose la question :
A basketball team scores 216 points in 8 quarters . Find the teams point per quarters rate
Penny Nom lui répond. |
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Simplify the expression |
2012-02-12 |
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Christy pose la question :
Hi guys, ok so I'm having problems with solving this equation since it's been so long I've done precal.
I have to find critical points so I have to find the derivative first. This is what I've done so far
s(t)= (t-6)^4 * (t+1)^2
t'= 4(t-6)^3*(1)*(t+1)^2+ 2(t+1)(1)*(t-6)^4
so this is where I got stuck, which is the algebra part. How can I simplify this to get the answer to figure out the critical points.
Penny Nom lui répond. |
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Two line segments in the plane |
2011-08-15 |
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Tim pose la question :
For this problem I actually have tried to visualise the image in my head many times. This question makes my head spin.
Four points lie in a plane. They are partitioned into two pairs so that the sum of the lengths of the segments joining the points of each pair has the minimal possible value.
Prove that these segments have no common points.
Chris Fisher lui répond. |
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Points on a graph |
2011-02-15 |
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Maggie pose la question :
Which set of ordered pairs can be used to graph y = -2x-1.
A.(-5,9),(1,-3),(4,9)
B. (-2,-5),(1,-1),(5,9)
C.(-2,-5),(0,-1),(4,-3)
D. (-5,9),(-2,3),(4,-9)
I cannot figure it out. Could you help me?
Penny Nom lui répond. |
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3 equidistant points on a circle |
2010-06-21 |
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Brian pose la question :
We have to line up 3 pins on a lifting bridle to be 120 degrees apart from each other to connect into a lifting assembly.
I know pi*d. I know straight lines connecting these points to each other will result in an equilateral triangle.
How does one find these points without using a protractor? There must be a formula (formulae) to work this out mathematically.
r = 10.5 inches
pi*d = 65.9736
3 segments( arcs) = 21.9912 which is the distance along the circumference that the points are from each other.
Penny Nom lui répond. |
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The midpoints of two sides of a triangle |
2009-03-17 |
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Manis pose la question :
Prove that the line joining the midpoint of two sides of a triangle is parallel to the third and half of it.
Robert Dawson lui répond. |
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3 equidistant points |
2008-12-01 |
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Damien pose la question :
How do you find 3 equidistant points (C,D,E) on a line between point A(Xa, Ya) and point B(Xb, Yb) so that AC, CD, DE and EB are all equal?
Chris Fisher lui répond. |
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The midpoint o a line segment |
2008-11-15 |
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Jane pose la question :
The vertices of a triangle are at (1,7), (6,-1) and (0,3). Find the coordinates of the midpoints of the sides.
Penny Nom lui répond. |
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A line through two points |
2008-09-10 |
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Conor pose la question :
Find the equation of the straight line which passes through the points (-2,14) and (8,-1)
Penny Nom lui répond. |
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The midpoints of the sides of a quadrilateral |
2008-07-22 |
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JOEL pose la question :
A QUADRILATERAL A,B,C,D HAS THE CO -ORDINATE [2,5],[8,7],[10,3]&[0,1] RESPECTIVLY [B,E,G,H] ARE THE MID POINTS OF THE SIDES AB,BC,CD&DA RESPECTIVLY FIND THE MID POINTS OF [FG]&[FH]
Penny Nom lui répond. |
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A point on a graph |
2008-07-08 |
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Rita pose la question :
If (2, b) is a point on the graph of y = (x^2) + 4x, find the value of b.
Leeanne Boehm lui répond. |
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Points on a graph |
2008-07-03 |
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Rita pose la question :
Dertermine if the given 3 points are on the graph of the equation.
Equation: y = (x^3) - [2(sqrt{x})]
Points: (0, 0); (1, 1); (1, -1)
Penny Nom lui répond. |
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Inflection points |
2008-01-25 |
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Armando pose la question :
Hi, Im trying to write a program that takes an equation ( f(x) = 0 ) and returns a list of the inflexion points in a given interval.
there must be (I think) a mathematical method or algorithm to do this, probably involving the (second) derivate of the function.
However I have not found such a method yet. Any help on this will be much appreciated.
Stephen La Rocque and Harley Weston lui répond. |
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Smallest cone containing a 4cm radius inscribed sphere |
2007-12-19 |
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Eva pose la question :
A sphere with a radius of 4cm is inscribed into a cone. Find the minimum volume of the cone.
Stephen La Rocque lui répond. |
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Local maxima, minima and inflection points |
2007-11-13 |
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Russell pose la question :
let f(x) = x^3 - 3a^2^ x +2a^4 with a parameter a > 1.
Find the coordinates of local minimum and local maximum
Find the coordinates of the inflection points
Harley Weston lui répond. |
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Find the equation of a line given two points |
2007-10-05 |
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Tiffany pose la question :
The equation for the line through the points (11,2) and (18,12) can be written in the form Ax+By=C.
Find A and B.
Victoria West lui répond. |
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Points that are 15 units from the origin |
2007-09-20 |
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Paula pose la question :
Find the coordinates of any point(s) 15 units away from the origin with an
x-coordinate of 9.
I was given the answer: (9,12) and (9,-12), but I do not understand how these numbers
were calculated. Thank you for your help!
Stephen La Rocque lui répond. |
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Points in a plane |
2007-06-01 |
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Gabrielle pose la question :
In general how many planes are there which contain two given points, three given points, and four given points?
Steve La Rocque and Walter Whiteley lui répond. |
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A set of points in space |
2007-04-04 |
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Lenny pose la question :
What is a set of points in space the same given distance from its center point called?
Stephen La Rocque lui répond. |
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Maximizing profit |
2007-01-23 |
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Denise pose la question :
Total Profit= Total Revenue-Total Cost P(x)=R(x)-C(x) Where x is the number of units sold. Find the maximum profit and the number of units that must be sold in order to get that profit. R(x)=5x C(x)=.001x^2+1.2x+60
Stephen La Rocque lui répond. |
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Points of intersection |
2007-01-18 |
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Mark pose la question :
Find the points of intersection of the given pair of curves. 2x - 3y = -8 and 3x - 5y = -13
Steve La Rocque and Haley Ess lui répond. |
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Points of intersection |
2006-08-20 |
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Gianella pose la question :
Find the points of intersection by solving this problem analytically.
y= x cubed
y= x
Stephen La Rocque lui répond. |
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Find the points of intersection |
2006-08-18 |
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Ingrid pose la question :
The question says find the points of intersection of the graphs of the equation, and check your results analytically.
x squared + y squared=25
2x+ y=10
Stephen La Rocque lui répond. |
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What's the difference between percentages and points? |
2006-04-21 |
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Sayed pose la question :
What is the difference between percentages and points?
Stephen La Rocque lui répond. |
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Find the point of inflexion for the curve y = e^x/(x^2-1) |
2006-03-31 |
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Sam pose la question :
Hi, i am trying to find the point of inflexion for the curve y = ex/(x2-1) and i got a really complex expression for y". I can't seem to solve x4-4x3+4x2+4x+3=0 so does that mean there is no point of inflexion?
Penny Nom lui répond. |
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The centroid of a triangle |
2006-01-18 |
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Andrea pose la question :
I am trying to find the centriod of a triangle. I have been given the three vertices of the triangle: A (-25, -20), B (-5, -40), and C (15, 30). I believe I calculated the correct midpoints: AB(E) (-5, 5), BC(D) (5, -5), and AC(F) (-15, -30). When I graphed these points I came up with the solution (-5, -10), but I can't seem to write the answer out (equations of the lines, etc) correctly. Any help would be greatly appreciated!
Penny Nom lui répond. |
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A point is twice the distance from y = 5 + 2x as it is from y = 5 - 2x |
2005-12-09 |
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Hazel pose la question :
A point moves so that its distance from the line y=5+2x is twice its distance from the line y=5-2x. Find the general form of the equation of its locus.
Penny Nom lui répond. |
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A fixed point problem |
2004-11-14 |
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Bob pose la question :
I am trying to solve an existence of fixed point problem. I need to show that a function f (on reals) with f'(x)=>2 has a fixed
point.
Claude Tardif lui répond. |
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Intersecting a line and a curve |
2004-01-29 |
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Senthil pose la question :
between line and curve how can i
find intersection point?
could you write me the formula and explanation also sir.
Penny Nom lui répond. |
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The mean house price |
2003-09-10 |
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Carol pose la question :
Question:
I have to find the mean from the following example: | Price Range £000 | No of Houses | | 55 and under 60 | 3 | | 60 and under 65 | 6 | | 65 and under 70 | 13 | | 70 and under 80 | 21 | | 80 and under 100 | 15 | | 100 and under 130 | 7 | | 130 upwards | 1 | I know when calculating the mean you use the mid points of the classes, but how does this work for the 130 upwards class? Also, does this still work given the difference in the classes (ie. 1st class is 5, 5th class is 20, etc). Any help to get me started would be greatly appreciated.
Penny Nom lui répond. |
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Collinear Points |
2003-01-13 |
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Gary pose la question :
Which of the 4 points are collinear when you construct the following concurrent lines or rays of a triangle? - P(1), the point where the angle bisectors intersect.
- P(2), the point where the altitudes (or extensions) intersect (inside or outside of the triangle).
- P(3), the point where the medians intersect.
- P(4), the point where the perpendicular bisectors (or extensions) of the three sides of a triangle intersect.
This is for my 9-12 high school class in geometry.
My name is Gary
Thanks for your help.
Gary
Harley Weston and Chris Fisher lui répond. |
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Compass points |
2002-11-05 |
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Mhairi pose la question :
I was asked this in maths but I am not sure if it is geography. Name all the compass points? We have been given 8 but he told us there is more and we have to name them.
Chris Fisher lui répond. |
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A set of points in space |
2002-03-18 |
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Victoria pose la question :
Describe the given set with a single equation or a pair of equations: The set of points in space that lie 2 units from the point(0,0,1) and at the same time 2 units from the point (0,0,-1).
Penny Nom lui répond. |
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Midpoints and endpoints |
2000-02-15 |
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Jessica Sipes pose la question :
I need to know how to find and endpoint using the midpoint and the other endpoint.
Penny Nom lui répond. |
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Graph question |
1998-05-12 |
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Rose Seminary pose la question :
Why is the point of intersection of two lines the solution to the corresponding system of equations?
Penny Nom lui répond. |
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How many intersections? |
1997-10-08 |
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James pose la question :
(a) A collection of eight points, no three collinear. If lines are drawn between each pair of these points, how many points of intersection would there be? (b) what would your answer have been in part (a) if there had been n points to start with?
Chris Fisher lui répond. |
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