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

Tutors Answer Your Questions about Expressions-with-variables (FREE)

Question 218130: -3+x=1
this is solving equations with variables on both sides
Click here to see answer by drj(1380)

Question 218129: -3+x=1
this is solving equations with variables on both sides
Click here to see answer by drj(1380)

Question 218329: how do you do this promblem .
s= n\2(a+t), for N ??
Click here to see answer by jim_thompson5910(28595)

Question 218498: a woman invested twice as much at 5% as she did at 6%. the total amount of interest she earned in 1 year from both accounts was $688. How much did she invest at each rate?
Click here to see answer by checkley77(12569)

Question 218542: If x squared = x cubed, give the two possible variables for x.
Click here to see answer by stanbon(57347)

Question 218471: 8t-r=12t
Click here to see answer by checkley77(12569)

Question 218658: child a is 4 years older than b. the product of their ages is 140.
the equation is x(x-4)=140
how do you solve for x?
Click here to see answer by drj(1380)

Question 218690: 6r+2(r+4)
Click here to see answer by rapaljer(4667)

Question 218735: I'm having trouble with this one!!
1/a + 1/b = c "solve for a"

Click here to see answer by drj(1380)

Question 218962: please help me to understand the GCF of the algebraic expression of 21ab, 14b
Click here to see answer by Alan3354(30993)

Question 218977: x/7+16 when x=14

Click here to see answer by MathRockslol(1)

Question 219127: uumm i dnt understand how to slove 2x+2y=6
Click here to see answer by jim_thompson5910(28595)

Question 219132: 7- (-4t) = 4t-14-21t
Click here to see answer by checkley77(12569)

Question 219155: 2.8-3x=20 what is x?

Click here to see answer by kannan(2)

Question 219154: 2.8-3x=20 what is x?

Click here to see answer by checkley77(12569)

Question 219403: What are the steps to simplifying expressions and solving for the variable??
IM LOST my teacher totally sucks at teaching......
Click here to see answer by Theo(3464)

Question 219424: (1-x)/2 = 7
2[1-x)/2 = 7]2
2-2x = 14
-2x = 12
x = -6
Click here to see answer by rapaljer(4667)

Question 219497: The perimeter of the triangle is 48centimeters. The longest side is 6 centimeters less than the sum of the other two sides. Twice the shortest side is 5 centimeters less than the longest side. Find the lengths of each side.
I began by trying to come up with the equations: (a=shortest side; b=middle, c=longest side; and P=48)
a+b+c=48
2a=5-c
c=6-(a+b)

Click here to see answer by checkley77(12569)

Question 219570: A rubber ball is dropped from the height of 13.5 feet. After each bounce the ball only goes up by 60% of what it did on the previous bounce. How high will the ball go after the 38th bounce? I took the 13.5x .6 for the 1st bounce which is 8.1Ft. and the 2nd bounce is 4.9ft. and the third is 2.9ft. I could do this for all the bounces but it would take me forever. How can I write a formula to just put in bounce to get height?
Click here to see answer by josmiceli(9678)

Question 219509: Keli is going to make 12lbs of mixed nuts for a party. If she can spend $76.50 on nuts and peanuts cost $1.50 a pound and fancy nuts cost $8.00 per pound. How many pounds of each should she buy?
I worked it up like this but I think I an way off... (x=peanuts; y=fancy nuts)
x+y=12
1.5x+8y=76.5
-8x-8y=-96
1.5x+8y=76.5
-6.5x=-19.5
x=3
3+y=12
y=9
3lbs peanuts and 9 lbs of fancy nuts
3*1.5=4.5
9*8=72
72.00+4.50=76.50
Click here to see answer by ankor@dixie-net.com(15652)

Question 219615: 6x-2-x=21-3x
Click here to see answer by rfer(12660)

Question 219632: 3/4c-0.11=0.23(c-5)
Solve for c.

Click here to see answer by checkley77(12569)

Question 219730: Mario is 3 years younger than David? You want ti write an algebraic expression to show Mario's age. What will be your constant? your variable?
Click here to see answer by ptaylor(2048)

Question 219814: 1/4+5=-3
Click here to see answer by checkley77(12569)

Question 219859: How to solve an equation like this 2r+5=7p+2

Click here to see answer by stanbon(57347)

Question 219952: -5/6m = 25
Click here to see answer by rfer(12660)

Question 219952: -5/6m = 25
Click here to see answer by MathTherapy(1424)

Question 220338: 3(x+7)=7x-15 Please show all work
Click here to see answer by rfer(12660)

Question 220369: Solve by the elimination method.
3x-9y=1
3x-9y=2
Click here to see answer by checkley77(12569)

Question 220441: Solve for y.
8x - 8y = 5
Click here to see answer by rapaljer(4667)

Question 220006: How do I solve this equation 7x-4=-2x+1+9x-5
Click here to see answer by likaaka(51)

Question 220734: Solve for x:
2x+1 <3
_____
x-5
I tried this:
x and x cancel eachother so its
x+1 <3
___
-5
then multiply the demonator and numerator by 5/1 so that leaves x<3???
Click here to see answer by tutor_paul(490)

Question 220865: Solve for variable y

ay/x=cz
Click here to see answer by checkley77(12569)

Question 220886: 49 more than some number
Click here to see answer by edjones(7569)

Question 221205: Can you walk me through this problem to get the answer..Here is the problem.... 5=5x+27
Click here to see answer by Alan3354(30993)

Question 221284: (4+y)/5=y/z solve for y. I don't know how to get rid of the fractions!
Click here to see answer by nerdybill(6958)

Question 221284: (4+y)/5=y/z solve for y. I don't know how to get rid of the fractions!
Click here to see answer by drj(1380)

Question 221295: st+5b-bs-5t how do you factor out this problem?
Click here to see answer by drj(1380)

Question 221295: st+5b-bs-5t how do you factor out this problem?
Click here to see answer by RAY100(1637)

Question 221403: The Fahreheit and Celsius scales are related by the equation F=9/5C+32. What temperature Celsius would give the body temperature of 98.6?

Click here to see answer by drj(1380)

Question 222001: I am trying to do an nineth grade math class in the eighth grade. This is my first advanced class and am struggling really horribly. We are learning Defining one variable in terms of another. I have the problem: The length of a rectangle is 3 inches more than the width. The perimeter is 30 inches. Define a variable for the width, Write an expression for the length in terms of the width, Write an equation to find the width of the rectangle. Solve you equation, and what is the length of the rectangle.
Click here to see answer by solver91311(16885)

Question 222014: 1/2a+7=3/4a-4

Click here to see answer by rfer(12660)

Question 221974: Solve by the elimination method. 7r-5s=-12 5r-7s=76
What is the solution of the system?
Click here to see answer by checkley77(12569)

Question 222052: a rectangle field has a length which is one or more than the product of seven and the width Write and simplify an expression to find the area of the field
so i was thinking
7+1xw= area of rectangle
W = width
Click here to see answer by solver91311(16885)

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