Questions on Algebra: Expressions involving variables, substitution answered by real tutors!

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Algebra: Expressions involving variables, substitution

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Question 141143: (M + N)x to 2nd power - 6x(M + N) + 8(M + N)
Click here to see answer by solver91311(5072)

Question 141142: Factor completely:
-2x to 3rd power + 16x to 2nd power - 24x
Click here to see answer by ankor@dixie-net.com(6693)

Question 141201: The question is "Solve for the indicated variable," 2m+3+n....Solve for m
Click here to see answer by vleith(1977)

Question 141145: Solve
(2x + 3y = 7
(x - 2y = 7 (Use substitution.)

Click here to see answer by nabla(412)

Question 141144: Solve:
(4x - 5y = 10
(3x - 2y = 4 (Use elimination.)
Click here to see answer by checkley77(7072)

Question 141228: Solve for the indicated variable r+s/t=u.....solve for t
Click here to see answer by ankor@dixie-net.com(6693)

Question 141228: Solve for the indicated variable r+s/t=u.....solve for t
Click here to see answer by stanbon(26296)

Question 141146: Solve
x - 3/4 - x/7 = 5
Click here to see answer by ankor@dixie-net.com(6693)

Question 141321: True or false.
The polynomial has a degree of two.
Click here to see answer by Edwin McCravy(2922)

Question 141320: True or false
The polynomial 79xy is called a binomial.
Click here to see answer by Edwin McCravy(2922)

Question 141319: Simplify (factor if necessary):

Click here to see answer by Edwin McCravy(2922)

Question 141362: (7x^3-6x^2-3x)/(x+2)
Click here to see answer by checkley77(7072)

Question 141317: Find the perimeter. Corners that look square are suare.
7m by 3m
Click here to see answer by checkley77(7072)

Question 141314: Find the perimeter. All angles are right angles.
4" and 3". and 3" and 3" and 10" and 7".
Click here to see answer by checkley77(7072)

Question 141425: 5-4x 8
---- = -
2-9x 7
Click here to see answer by checkley77(7072)

Question 141616: Solve the substitution:
(3x + 5y = 5
(x -2y = 9
Click here to see answer by oscargut(682)

Question 141611: Simplify
y/b + x/b
____________
y/b - x/b
Click here to see answer by oscargut(682)

Question 141615: Solve by graphing and check:
(y= 2x -2
(y= -4x + 4
Click here to see answer by checkley77(7072)

Question 141609: Simplify:
square root of 50.
Click here to see answer by nabla(412)

Question 141612: Simplify
6-a/6
_______
a/3
Click here to see answer by jojo14344(1483)

Question 141606: Solve
x-3/4 - x/7 = 5

Click here to see answer by Shifa(4)

Question 141607: Convert
2.75 x 10to -5 power to usual notation.
Click here to see answer by checkley77(7072)

Question 141610: Simplify:
-4 square root 27 + 2 square root 12
Click here to see answer by checkley77(7072)

Question 141658: I need to simplify a sum involving three terms,

( 1/a squared b c ) - (2a/b squared c) - 3/a c
if there were two terms i would simply multiply top and bottom of each term by divisor of the other term.
with three terms should i try to make three terms into two? I am really stuck HELP
Click here to see answer by stanbon(26296)

Question 141681: find the volume of a box : height is 6x. length is 2x-5. width is 4x+2.
can you please show me how you got the answer??
thanks. :]
Click here to see answer by nabla(412)

Question 141957: Lydia takes seven minutes more to complete an illustration than Tom. The total time taken by both of them is six hours. Form an algebraic equation to express this and identify the variables, coefficients, and constants of the algebraic expression.

Click here to see answer by ankor@dixie-net.com(6693)

Question 141961: Divide 3x2y + 6xy2 by xy
Click here to see answer by HyperBrain(694)

Question 142005: The number 2/3 belongs to what subsets of real numbers?
Click here to see answer by oscargut(682)

Question 142003: If f(x) = x + 2/3, then the value of f(0) equals.
Click here to see answer by oscargut(682)

Question 142002: Complete
Use four unit multipliers to convert 75 square meters to square inches. Show how.
Click here to see answer by stanbon(26296)

Question 141995: Consider the points (-4,6) and (2,1).
What is the slope of the line connecting these points? What is the equation of the line connecting these points?
Click here to see answer by ankor@dixie-net.com(6693)

Question 141998: The amount of Flim (I) is inversely propportional to the amount of Flam (A).
When 52 pounds of Flam produce 13 pounds of Flfim, what si the constant of proportionality.
Click here to see answer by jojo14344(1483)

Question 141960: Subtract x2 + y2 + 3xy from 4x2 + 2xy - 3y2
Click here to see answer by jojo14344(1483)

Question 141959: Add
(5x2 + 7y - 6z2), (4y + 3x2), (2y - 2x2)
Click here to see answer by checkley77(7072)

Question 141958: Multiply
(4x2y2), (6ax2y6)

Click here to see answer by checkley77(7072)

Question 142241: What is the distance between

(7,-3) and (-1,4) ?

We haven't learned this yet, but I'm skipping ahead on a lesson and need some help.
Click here to see answer by scott8148(3385)

Question 142245: The variables x and y vary inversely. When x is 10 and y is 7.
If x is 5, then y is ___ ?

I do not understand how to set this up?
Click here to see answer by MathLover1(1183)

Question 142243: What is
14x^2 + 12x - 6 divided by 7x - 1 ?
Click here to see answer by nabla(412)

Question 142275: Simplify 4x [(7x2 + 2x - 5) + (3x2 + 9x)/3x

Click here to see answer by ski2002(1)

Question 142387: If P = 7y + 2xy - 6x and Q = 5 - 7y, find the value of 3P - 4Q.

Click here to see answer by checkley77(7072)

Question 142385: Simplify the expression:
3 - [7x + 2y - {5x - 9y} + 2x + 4y]

Click here to see answer by ptaylor(1578)

Question 142388: In an auditorium there are 4x rows, and each row can accommodate 5yz benches. If x students can be accommodated in each bench, then how many students can sit in the auditorium?

Click here to see answer by ptaylor(1578)

Question 142541: ok.
3y=9x+12

i know you divide 3y by 3 to cancel it out so all you have is y.
and then i know you divide 12 by 3 to get 4.
this makes it y=9x+4.
do i also divide 9x by 3?
then the answer is
y=3x=4.
this looks more right.
Click here to see answer by jim_thompson5910(13794)

Question 142584: Mike invested $6000 for one year. He invested part of it at 9% and the rest at 11%. At the end of the year he earned $624 in interest. How much did he invest at each rate?
Click here to see answer by vleith(1977)

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