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 11577: I need help with this problem, and I also don't really understand multi step equations.
13=5-13+3a

Click here to see answer by elima(1433)

Question 11558: 3x= 4 and 1/2
Click here to see answer by elima(1433)

Question 11583: Please help me solve this equation: Solving for y: .

I have tried moving -12xy to the left side, I have tried xy(4y+9x) all I manage to do is confuse myself.
Your help would be greatly appreciated.
Thank you,
Monica
Click here to see answer by khwang(438)

Question 11760: How do I solve this problem 7n=-35n-6? I did -35n+35=0 42n=-6 n=-7
Please help?
Click here to see answer by Earlsdon(4898)

Question 11768: HOW WOULD YOU SIMPLIFY THIS EXPRESSION AND WHAT IS THE THINKING IN DOING SO ?

8A + B - 2A - 4B
Click here to see answer by elima(1433)

Question 11775: what is g-6=2?
can you show me the steps?

Click here to see answer by elima(1433)

Question 11844: how many minutes are in 330 seconds? in s seconds?
Click here to see answer by rapaljer(3620)

Question 11849: the difference between 2 numbers is 8. the smaller number is m. the larger number is ?
Click here to see answer by rapaljer(3620)

Question 11850: 1/3(2a/5-3)+4/15-2/3
Click here to see answer by rapaljer(3620)

Question 11837: Can you please help me solve 3x-y=x+3?
I don't understand howw to do equations with more than one variable. Could you please explain it to me?
Click here to see answer by rapaljer(3620)

Question 11833: 2x-(9x-4)
Click here to see answer by longjonsilver(2297)

Question 11820: Evaluation the expression for the given value of the variable:
1. 8a when a=4
2. c+15 when c=12.5
Click here to see answer by elima(1433)

Question 11868: x+6=9
Click here to see answer by elima(1433)

Question 11834: Carla goes to Bargain Music and buys 4 used CDs and 7 new CDs. She pays a total of $65. Later, Tim goes to Bargain Music and pays $33 for 4 used Cds and 3 new Cds.
The equations below can be used to determine the cost of a used CD (x) and the cost of a new CD (y).
4x+7y=65
4x+3y=33
What are the costs of the two CDs?
these are the answeres
$2.25 per used CD and $8 per new CD
I don't know how they got that answere and if you could explain it to me, I would very much appritiate it. Thanks!
Click here to see answer by elima(1433)

Question 11890: In the expression (-2)^5, the 5 is called the ______________, and the -2 is called the _____________________.
Click here to see answer by Earlsdon(4898)

Question 11897: Write the algebraic expression that corresponds to the sum of a number and 8.
Click here to see answer by Earlsdon(4898)

Question 11898: Write the algebraic expression that corresponds to five times the sum of a number and the opposite of 12.
Click here to see answer by elima(1433)

Question 11952: 3a+7=31
Click here to see answer by snh(2)

Question 12015: Dear Tutor: This is my first year taking algebra I need your help really bad. Thank you so much:
Evaluate the expression for the given value of the variable:
1.4/3.x when x=1/6
2.24/x when x=3
3. 9d when d=0.5
5. 5/16-p when p=3/8
Click here to see answer by rapaljer(3620)

Question 12037: i need to know the steps so that i may help my son under stand more clearly.The processof expressions involving variables and substitution.
Click here to see answer by rapaljer(3620)

Question 12162: I need help! problem is 3/4t-5/4=1/3t
Click here to see answer by elima(1433)

Question 12175: Please help solve this equation. I am a parent trying to understand what I need to explain. 5-1/2(x-6)=4.
Click here to see answer by rapaljer(3620)

Question 12178: 4M-(M+8)-12
Click here to see answer by askmemath(368)

Question 12213: 2x-15/6=x/9+3x/4
Click here to see answer by rahman(247)

Question 12214: -1/3m = -2
Click here to see answer by elima(1433)

Question 12194: Simplify : 2(10m-10k)+ 5(14m-3k)
Click here to see answer by elima(1433)

Question 12215: 3/4B-1/2 =5/8B
Click here to see answer by elima(1433)

Question 12304: the perimeter of a triangle is 76cm. side A of the triangle istwo times the length of side B. side C is one cm more than side A. what is the lengths of the sides?
Click here to see answer by askmemath(368)

Question 12314: what is 5n-2(n-2)=-11
Click here to see answer by rahman(247)

Question 12294: 50=15-6(2x-5)

and

3(-6x+9)-10x=1
Click here to see answer by rahman(247)

Question 12315: what is 5n-2(n-2)=-11
Click here to see answer by gsmani_iyer(161)

Question 12295: -9(8-m)-13=5

and

18(-x-2)-4(-9+3x)=-14
Click here to see answer by bonster(299)

Question 12280: (6b-2)(3b)
Click here to see answer by bonster(299)

Question 12421: Simplify (3x^2y^3)(2x^3y)

Click here to see answer by maribeth_abella(11)

Question 12434:
Click here to see answer by kchande(5)

Question 12433: simplify: -xy^-2(3x^-1y+2xy^3-4y)
Click here to see answer by kchande(5)

Question 12540: 5x-3x+12=8
Click here to see answer by maribeth_abella(11)

Question 12509: Hi could you help me with this problem please, thank you so much! Here is the expression: 12(1/4x + 1/3) - 1/2(12x - 6). Thank you so much!!
Click here to see answer by maribeth_abella(11)

Question 12539: how do you solve:
(x+5)-(x+6)

Click here to see answer by maribeth_abella(11)

Question 12584: I don't get how you do fractions like A/2+5=10 I get all confussed what do I do?
Click here to see answer by rapaljer(3620)

Question 12526: 1) 99=3a
2) 6.5b=3
3) c/6=12
4) 4=d/12
5) c/0.3=150
6) 5=4f
7) g/12=16
8) 1.2h=3.6
9) 19=j/0.4
10) k/14=39

Click here to see answer by MArk_HeRras(6)

Question 12658: I need to solve the formula in terms of the given variable ad = f;a
I have no idea what to do, please help!
Click here to see answer by AdolphousC(70)

Question 12744: I need help, helping my daughter with her homework. I am stuck on these 2 problems.
b+3/e = f/2 ; e and Find A if P = 14.8lb/in. squared and F = 2960 lb
Click here to see answer by glabow(165)

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