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 8478: How do you solve the problem x^2=1/9? I tried recriprocals but I am still confused...
Click here to see answer by arunpaul(104)

Question 8474: SIMPLIFY EACH EXPRESSION.
12a-a
Click here to see answer by arunpaul(104)

Question 8487: need answer for the expression 8x - 3, x = the fraction 5 over 2?
Click here to see answer by bonster(299)

Question 8514: Solve: The sum of 35 and z
Click here to see answer by prince_abubu(198)

Question 8565: 12n=12
Click here to see answer by DoodleBopper(4)

Question 8583: Number of Tapes Cost
1 $8.50
2 $17.00
3 $25.50
4 $34.00
Define variables and write equation to model the relationship in each table.

Click here to see answer by rapaljer(3620)

Question 8592: Name the operation in this expression -xy also x(-y) and -x-y.

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Question 8612: Solve for b, a(b-2) / c-3
Click here to see answer by rapaljer(3620)

Question 8610: The problem asks me to solve usling any method.
5x+6y=14
y=4x-17
I am not sure which method to use. I tried both but did not come out with the same answer both times! Thanks for your help!
Click here to see answer by rapaljer(3620)

Question 8649: Solve: (7t-21)+(t+4)=15
Click here to see answer by jennifer(9)

Question 8648: Solve: 7y+44=12y+11
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Question 8619: simplify the expression
-6(6zv-4)+5(4zv+9)
Click here to see answer by jennifer(9)

Question 8751: Plese help me to factorise the expression:
-4(x-2y)^2+8(x-2y)
Regards
Click here to see answer by gsmani_iyer(161)

Question 8736: 3x + 2(x + 4)= -7
Click here to see answer by gsmani_iyer(161)

Question 8826: This is the problem I am stuck on.
5(y-2)=-2(12-9y)+y
This is what I did:
5(y-2)=-2(12-9y)+y
5y-10=-24+18y+y
5y-10=-24+19y
5y-10+10=(-24+10)+19y
5y=14+19y
5y-19y=14
-14y=14
y=-1
Is this right or did I mess up somewhere.
Thanks for any help.

Click here to see answer by Earlsdon(4898)

Question 8877: I am trying to help my daughter & I am so confused by "simplify the variable expression, here is the problem... (5)(-x) what is the answer & how do we do this? please help
Click here to see answer by rapaljer(3620)

Question 8912: answer with work please.2/3x-5=5(x-3)
Click here to see answer by Abbey(339)

Question 8977: I am trying to help my daughter with Alg 1 homework - is the correct answer -11?
2x - 7 = 3x =4
Click here to see answer by longjonsilver(2297)

Question 9037: Is this right?
simplify: v^1/3*v^2/5
= v^2/15
Thanks
Click here to see answer by prince_abubu(198)

Question 9064: Should be a simple expansion, but can't get through the working out.
Expand:
(n-2)^3+6(n-2)^2+12(n-2)+8
Click here to see answer by longjonsilver(2297)

Question 9043: Can you help?
(x+1)(3x-4)-(x-1) Simplify
I got x^2+3x-4, is this right?
Click here to see answer by longjonsilver(2297)

Question 9105: i have a algebra question that says after how many weeks will each be the same wieght . but when i entered the equation in the graphing calculator it doesnt have an exact answer. her is the problem:

Fred weighs 187 pounds but is on a diet that makes him lose 1.7 pounds per week. Joe only weighs 93 pounds and is on a diet that makes him gain .9 pounds per week. let x be the number of weeks passed.
Click here to see answer by sabanasir(22)

Question 9135: solve for x in terms of the other variables
ax-b=x+c
Click here to see answer by longjonsilver(2297)

Question 9182: i have a graph that states number of sales,and total earnings are:
5 $2.00
10 $4.00
15 $6.00
20 $8.oo
so how would i write an equation for that?
Click here to see answer by rapaljer(3620)

Question 9206: what is the answer for this. instructions- rewrite each expressionusing the distributive property. then simplify
Click here to see answer by rapaljer(3620)

Question 9215: (3a/4)+1=(2a-1)/3 please solve and show how
Click here to see answer by lucky83(12)

Question 9313: i think that this is expressions involving variables, substitution, but my book doesn't say. I don't get what i'm supposed to do. the problem is -(3-x) and i just don't know how to simplify it. i just don't know how to work it and my math book doesn't explain anything. can you help me?
Click here to see answer by rapaljer(3620)

Question 9316: 3a/5=2a+1
slash mark is fraction not division
I am not sure how to do an equasion with a fraction in it. me and my mom have tried everyway possible.
Click here to see answer by rapaljer(3620)

Question 9312: 7 squared - 5 squared
_______over__________
5 cubed

this is a fraction.
Click here to see answer by rapaljer(3620)

Question 9309: solve each system using subtition .Write no solution or infinitely many solutions where appropriate
the problem is
y=x
y=-x+2

Click here to see answer by rapaljer(3620)

Question 9353: What is the answer for the number of inches in x feet?
Click here to see answer by longjonsilver(2297)

Question 9387: how do I solve this 5x-2{3-2[(x-3)]}
Click here to see answer by mathmaven53(29)

Question 9405: I am having trouble figuring out this problem. Could you please help me?
9x + 7 = 5x - 3
Click here to see answer by huntingmaster325(15)

Question 9190: solve for x in terms of the other variables
b(x-d)=c(x+d)
Click here to see answer by prince_abubu(198)

Question 9433: Math question : Finding the avergage speed for given distance and time such as... A car travels 240 kilometers in 2 1/2 hours? How can i solve this problem?
Click here to see answer by rapaljer(3620)

Question 9326: if pencils cost 20 cents each and pens cost 30 cents each, find the cost of the following items.
4 pencils p pencils r pens and p pencils
Click here to see answer by rapaljer(3620)

Question 9184: how do i write an expression for......; 6.7 more than 5 times n
Click here to see answer by rapaljer(3620)

Question 9183: how do i put 6.7 more than 5 times N in an expression?

Click here to see answer by rapaljer(3620)

Question 9445: Math Question: Simple Intrest = Amount of deposit x Interest rate(decimal) x time (years). What is the simple interest earned?
deposit $2000
6.5 Interest
1.5 yrs
Click here to see answer by DWL(56)

Question 9497: Write an expression for the perimeter of the traingle. Example one side of triangle is
3x another is 4x and the others is 5x. Which expression do i write?
Click here to see answer by prince_abubu(198)

Question 9575: P=a+2b+2c solve for a
Click here to see answer by thecampusnerd(13)

Question 9540: how can I solve this expression help please :
13- 3a for a = -1
Click here to see answer by thecampusnerd(13)

Question 9654: what is the distributive property? How do you rewrite an expression using distributive property?
Click here to see answer by thecampusnerd(13)

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