.
. centre de ressources dilemmes et doutes le visage humain de mathématiques Qui sommes-nous Problème de mois activités de promotion babillard
Centrale des maths - centraledesmaths.uregina.ca
Dilemmes & doutes
« D & D »
. .
topic card  

Sujet:

variable

liste de
sujets
. .
nouvelle recherche

48 articles trouvés pour ce sujet.
 
Page
1/1
Can one equation with two variables be solved algebraically? 2019-08-30
Don pose la question :
Can one equation with two variables be solved algebraically?
Penny Nom lui répond.
An impossible problem 2017-09-15
Fay pose la question :
Given math homework problem of: Gary and Larry given 2 numbers and told to add together. Gary subtracted and got 14. Larry multiplied and got 799. I tried substitution:
X-Y=14 and X x Y=799
X= Y+14
(Y+14) Y=799 and here I'm stuck at Y squared+14 Y= 799
using substitution I got 47x17=799 but not 14b when subtracted. HELP?????

Penny Nom lui répond.
Linear equations in two variables 2015-12-13
priya pose la question :
I have problem in solving these equations please help me today itself very urgent:
I)2x+y=y
II)pie*x+y=9

Penny Nom lui répond.
Differentiate x^x - 2^sinx 2013-08-09
tarun pose la question :
derivative of x^x - 2^sinx
Penny Nom lui répond.
An equation in two variables 2013-05-14
Steve pose la question :
Verify solutions to an equation in two variables. 4x-2y=8 (3, 2)
Penny Nom lui répond.
Introductory algebra 2012-10-30
kevon pose la question :
if x = 7 is used in the expression 2x + 5 what is the output
Penny Nom lui répond.
Minutes and seconds 2012-08-29
Casey pose la question :
I have to write a variable equation. The questions says there are 60 seconds. but we need to write and equation to solve for minutes. Is it 1/60 or 1/s
Robert Dawson lui répond.
Coefficient of variation 2011-04-14
Braden pose la question :
When determining coefficient of variation (CV) or %CV is it possible to calculate %CV for two variables? For instance can %CV be used to determine the precision of 5 data points on a graph using the X and Y coordinates? or does %CV need to be determined for each variable separately?
Robert Dawson lui répond.
A binomial random variable 2010-11-29
yvette pose la question :
a binomial random variable has a mean equal to 200 and standard deviation of 10. find the values of n and p.
Penny Nom lui répond.
Simultaneous Equations 2009-07-06
Mukulu pose la question :
Solve the equation simultaneously X/5=(Y+2)/2= (Z-1)/4 ……………….eqt 1 3X+4Y+2Z-25=0 ………………eqt 2
Janice Cotcher lui répond.
An infinite number of solutions 2009-03-24
Sean pose la question :
this is a linear equations problem;

first:
3535.5 + Fbd (.866) + Fbc (.5) - Fab (.5) = 0
and
-3535.5 - Fab (.866) - Fbc (.5) - Fbd (.5) = 0

Harley Weston lui répond.
6^x = y 2009-02-12
Jamie pose la question :
Find x: 6^x=y
Harley Weston lui répond.
The whole number that precedes a number w+3 2009-01-17
Morgan pose la question :
write a variable expression for "The whole number that precedes a number w+3"
Penny Nom lui répond.
An expression for q quarters and n nickles 2009-01-16
Morgan pose la question :
a variable expression for:

"The value in cents of q quarters and n nickels"

Penny Nom lui répond.
Equations with the variable in the exponent 2008-10-28
fari pose la question :
Solve for x

5 * 4^x-3=40
5^x=25^(x+8)

Penny Nom lui répond.
A homework problem 2008-10-28
Shawn pose la question :
I'm checking my son's homework and we disagree on the solution. The problem reads: 135mn^4 (n to the 4th power) over 50n^2 (n squared) I think the answer is: 27mn^2 (squared) over 10 Can you help?
Penny Nom lui répond.
An algebraic expression 2008-08-29
Antonio pose la question :
write a variable expression for 9 less than k
Penny Nom lui répond.
Solve for y in terms of x 2008-08-10
Rosie pose la question :
Solve equation for y

-4x=12+3y

Penny Nom lui répond.
Solving for Two Variables 2008-07-24
Mary pose la question :
can you help, 2/35= 1/x +1/y ; x
Janice Cotcher, Victoria West and Harley Weston lui répond.
g(m-1,2n)+n 2008-06-07
Florence pose la question :
What does g(m-1,2n)+n for m>0, n>=0 mean.
Penny Nom lui répond.
How do you reduce an equation with multiple variables? 2008-04-30
Jonathon pose la question :
How do you reduce an equation with multiple variables?

For example, if 3x + y = k(x-3), what would x be equal to?

Penny Nom lui répond.
A dependent variable 2008-01-30
lavada pose la question :
i need the definition to dependent variable
Stephen La Rocque lui répond.
Working with x 2007-10-12
Robert pose la question :
The question: The measure of an exterior angle of a regular polygon is given. Find the measure of an interior angle, and find the sides.
41. 36
42. 18
44. 'X'

The attachment has what she has done for 41 and 42. Need help with 44 (lots of help) Thank you in advance for your site and your help. Robert

Penny Nom lui répond.
Express a certain variable as a function of another variable 2007-06-12
Gilligan pose la question :
The volume V of a right circular cone is V = (1/3)pi(r^2)(h). If the height is TWICE the radius, express the volume V as a function of r.
I see the phrase "express a certain variable as a function of another variable" a lot in math books. What exactly does that mean? Is there another way to say the same thing?

Stephen La Rocque lui répond.
Three equations in three unknowns 2007-03-18
Shawna pose la question :
You are told that you are working with three different numbers. When the first number is added to twice the other two numbers, the result s 64( i.e x+2y+2z= 64). When the second number is added to twice the other two numbers the result is 62 (y+2x+2z=6). Finally, when the third number is added to twice the other two numbers, the resut is 59 z+2x+2y=59) Determine the three numbers?
Penny Nom lui répond.
How do you write a variable expression 2006-10-11
Josh pose la question :
How do you write a variable expression for the following:

The amount of money Waldo has if he has $10 more than Joe and

How much weight Kirk can lift if he lifts 30 lbs more than his brother.

Stephen La Rocque lui répond.
Parameters 2006-09-15
Chase pose la question :
What is the meaning of the word "parameters" when used in reference to Algebra.
Penny Nom lui répond.
Degree 2006-02-09
Jessica pose la question :
I am a 9th grade home school student and have started doing degrees of terms in my math book. The following is some examples they give:

25a to the 4th power is a 4th degree term

67c to the 9th power is a 9th degree term

x is really x to the 1st power so it is a 1st degree term

10 is really 10x to the 0 power so it is a 0 degree term

They go on to say that every constant is a zero degree term.

My question is why isn't a constant, like 10, simply to the 1st power (making is a 1st degree term) like x.

Claude Tardif lui répond.
Simplify the variable expression: 3g^2h over 12gh 2006-02-09
Andrew pose la question :
okay the question says simplify the variable expression: 3g2h over 12gh
how would u do this?

Penny Nom lui répond.
I = PRT 2005-11-16
Ryan pose la question :
Use the formula to find the value of the variable that is not given:
I=PRT;I=$2880, R=0.08, P=$12,000

Penny Nom lui répond.
A variable rectangle 2005-11-08
Mussawar pose la question :
find the lengths of the sides of a variable rectangle having area 36 cm2 when its perimeter is minimum i do not want solution of this question. i would like to know what is mean by variable rectangle.and what is difference between rectangle and variable rectangle.also what is mean by when its perimeter is minimum.
Penny Nom lui répond.
Can we take the derivative of independent variable 2005-10-18
Mussawar pose la question :
why we take derivative of dependent variable with respect to independent variable .can we take the derivative of independent with respect to dependent.if not why.
Walter Whiteley lui répond.
Coefficients, constants and like terms 2005-10-05
Elizabeth pose la question :
In the equation -8y+6ab+7-3ab what are the coefficients; the like terms and constants?
Penny lui répond.
Solve for a and t 2004-10-23
Justin pose la question :
How do I solve for "a" and "t" in the equations:

1000t= -4000 + 2000t + (1/2)at^2
1000=2000 + at

Penny Nom lui répond.
x^2/3 - 7 x^1/3 + 12 = 0 2004-04-05
Jackie pose la question :
I am having trouble solving this question for x:

1.) x^2/3 - 7 x^1/3 + 12 = 0

Penny Nom lui répond.
The quadratic formula 2003-08-31
Alex pose la question :
I am using Houghton Mifflin's Precalculus with Limits book, 2nd edition. However, the first chapter encompasses Algebra review, and I am stuck on a problem. All that's required is to solve the following and verify using a calculator:
3y2+6y+2=0
I have solved the problem using the quadratic formula, but from what I remember, the quadratic formula is used in the case of equations following the AX2+BX+C=0 pattern. As the problem I am attempting uses a y-variable, can I still use the quadratic formula? Since I am not sure what route to take in solving this problem, I am hoping you can assist me.

Harley Weston lui répond.
A rule with a variable 2003-08-24
Crystal pose la question :
what is a rule with a variable
Penny Nom lui répond.
Water in a cone 2003-08-12
Adrienne pose la question :

Water is poured into a tank in the shape of an inverted right circular cone.ð The height of the tank is 8 m and its radius at the top is 4 m.

a. Draw and label a picture to represent this situation.ð (I know how to do this)

b. Identify all variable quantities. (h = 8m, r = 4m)

c. Find an equation that relates the variable quantities, and reduce the number of variable quantities to two.

I was thinking about the equation V = 1/3 pi r2 h, which is the Volume of a cone, but I am stumped as to how I am supposed to "reduce the number of variable quantities to two." Can you point me in the right direction?


Penny Nom lui répond.
x-6square root of x +8=0 2003-05-10
Elizabeth pose la question :
x-6square root of x +8=0
Penny Nom lui répond.
Simplifying Variable Expressions 2002-10-28
Erika pose la question :
i would like to ask you a mathematical question on Simplifying Variable Expressions. The question is 2(n-4)+3.
Penny Nom lui répond.
Variable expressions 2002-08-15
Brittany pose la question :
I am just learning variable expressions. My homework is to write a variable expression for each word phrase;

example :

the number of minutes in s seconds
the cost of x cartons of juice at $.75 each
And etc.

I don't understand it

Penny Nom lui répond.
3 = -2x 2002-05-05
Timothy pose la question :
My question is 3 = -2x

How do I isolate the variable here?


Penny Nom lui répond.
Factor completely 2002-03-07
Taylor pose la question :
I'm supposed to completely factor this but I don't know what to do with all the variables.

a3b5 - a2b5 - 12ab5.

Does it have anything to do with b5 being a common factor or am I completely off?
Penny Nom lui répond.

Solve for the variable 2001-02-28
Ashley pose la question :
I've got 2 questions. We (my dad and I) can not figure them out. please help me.
  1. 21 = 9 - 2 (4a + 2) and I am supposed to find out what the variable is.

  2. 2/3 n + 3/8 n = 15/16 (those are fractions). Again, I need to find out what the variable is.

Penny Nom lui répond.
Solve for two variables 2001-02-25
A student pose la question :
How do I solve for %1 and %2 in the following formula when T1, T2 and T3 are known? %1 and %2 are ratios of the same element, therefore %1 + %2 = 100%

(%1 x T1) + (%2 x T2) = T3

Penny Nom lui répond.
Some complex problems 2001-01-15
Nick pose la question :
I am having enormous difficulty with one question in my maths homework. The question is shown below. If anybody out there can find the answers and show the workings and help me to understand.
Harley Weston lui répond.
Random 1998-09-15
Hugh Ballantyne pose la question :
I am an occasional teacher.
Here is my question:
Does the word "random" have a technical meaning in mathematics?

Harley Weston lui répond.
The Central Limit Theorem 1997-04-21
Donna Hall pose la question :
A skeptic gives the following argument to show that there must be a flaw in the central limit theorem:
We know that the sum of independent Poisson random variables follows a Poisson distribution with a parameter that is the sum of the parameters of the summands. In particular, if n independent Poisson random variables, each with parameter 1/n, are summed, the sum has a Poisson distribution with parameter 1. The central limit theoren says the sum tends to a normal distribution, but Poisson distribution with parameter 1 is not normal.

What do you think of this argument?
Neal Madras lui répond.

 
Page
1/1

 

 


Centrale des maths reçoit une aide financière de l’Université de Regina et de The Pacific Institute for the Mathematical Sciences.

CMS
.

 

accueil centre de ressources accueil Société mathématique du Canada l'Université de Regina PIMS