Questions on Algebra: Evaluation of expressions, parentheses answered by real tutors!

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Question 65375: Write each expression in simplest form:
4r^2 - 25s^2
------------
2r^2 + 3rs - 20s^2
With this equation I am so lost and confused of how to even start the procedure! Is there any help out there for me? Thank you :-)
Click here to see answer by stanbon(75887)

Question 65515: Could you please help me solve te following equations, I seemto be getting stuck. Thank you very much! Evan
also and
Click here to see answer by checkley71(8403)

Question 64654: Evaluate the following expressions if a = -2 and b = 4.
2a^2-2b^2-4/3a+3b+1
Click here to see answer by checkley71(8403)

Question 64934: I need to simplify these but can't figure it out. I'm awful at math. Thanks for any help.
a. y^3 (10x^2 + 3y-1) (5x^3 - 3xy - y)
b. (a^2 + 2b)(5a^3 - 3b^-3/2 - 1)/b^-2

Click here to see answer by checkley71(8403)

Question 59358: what is the difference of 3 and 5 times a number? a(b+c) is the equations I am suppose to use
Click here to see answer by mvsuchil(1)

Question 66420: How do I write the algebraic expression for 7 less than m
Click here to see answer by uma(370)

Question 66462: It is so hard.
Click here to see answer by funmath(2933)

Question 66621: 2a-{6b-4[a-(b-3a)]}
Please help with this problem, also what type of problem would this be called?
Thanks in advance.
Bob
Click here to see answer by stanbon(75887)

Question 66736: I'm having trouble with this problem, could someone please help?
(-3 a b^-1 c^-3)^-3
______________
( 4 a^3 b^2 c^2)
Hope who ever helps with this understands, it hard to write this problem on a computer.
Click here to see answer by stanbon(75887)

Question 66463: Write an expression for amirs total salary for h hours work if he is paid 8.25 per hr.8.25 x h = 24.75 if h=3
Click here to see answer by stanbon(75887)

Question 66705: $12.4divided by(17-n)=$4.14
Click here to see answer by ptaylor(2198)

Question 66810: Simplify:
4.27-6.98+1.3
Click here to see answer by checkley71(8403)

Question 66909: please help me with this
3-6[2x-(8x+3)-6]+9
Click here to see answer by ptaylor(2198)

Question 67109: xy + 3z + y =
Click here to see answer by ronniecroberts(6)

Question 67249: I need help in evaluating the following expressions: Thanks in advance.
1. 53 - 3(2^5 - 22)

2. (5 * 2)^3

3. 10 - 3*(8 - 6)

4. 5 - 2^3
Click here to see answer by stanbon(75887)

Question 67273: WHAT DOES A NUMISMATIST COLLECTS?
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Question 67334: Hi, can you please help with the following? I need to solve these equations:

1. 2(h - 7) = -14

2. 1.6 + 4x = 8

3. (1/3)x + 5 = 7

4. (-2/3)x = 3/4

Click here to see answer by stanbon(75887)

Question 67331: I need help in evaluating the following expressions: Thanks in advance.
1. 5.4 - (-6.9)
2. (13 - 5) - (-2 + 6)
I also need to simplify the following:
1. -19 - x - 22
2. 30x*(1/6)

Click here to see answer by checkley71(8403)

Question 67307: how to solve equations with variables on both sides of wqual sides? 0-13-4354422-2

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Question 67391: 2/5x +1 = 1-x
On both sides of the equal sign are absolute value brackets. What I'm unsure of is, what or how do I get rid of the fraction 2/5x ?
Thanks,
Bob
Click here to see answer by stanbon(75887)

Question 67394: My problem is this 4(x+2)+2=4x+2(-2-x)+4
4x+8+2=4x-4-2x+4
4x+10=2x
2x=10
x=5
But when I check my answer, they don't equal. What I'm I doing wrong?
Click here to see answer by checkley71(8403)

Question 67395: 8x-4(x-4)=6y for y
I don't understand this.
Click here to see answer by checkley71(8403)

Question 67395: 8x-4(x-4)=6y for y
I don't understand this.
Click here to see answer by stanbon(75887)

Question 67467: Hi, would you please correct my solution (if required) for the following simeple equation.

My solution would be
(x^2-3x-2x+6)-(24x^2-28x-30x+35)
x^2-5x+6-24x^2+58x-35
-23x^2+53x-29
Click here to see answer by bam878s(77)

Question 67567: -16(15/5)+20/4(5)=
Click here to see answer by Cintchr(481)

Question 67587: Evaluate 4cd+c when c = -9 and d=-8
Click here to see answer by tutorcecilia(2152)

Question 67610: HI I REALLY TRIED MY BEST TO ANSWER THIS PROBLEM BUT I AMONLY IN THE SIXTH GRADE AND JUST STARTED THIS MATH AND I REALLY NEED SOMEONE TO WALK ME THROUGH EACH STEP OF THIS PROBLEM.I need to simplify the expression 5x-3x+4x.
Please help me Thank you
Click here to see answer by stanbon(75887)

Question 67899: I am stuck on this question:
3/4 * (4) squared
Click here to see answer by Zoop(21)

Question 67992: What is -9=9(9-5t)
Im trying my best 2 figure out what t=
Your help would be much appreciated
Click here to see answer by tutorcecilia(2152)

Question 68058: Please show how to solve the following equations.
2/5x = �10

x/6 + 3 = 9
Click here to see answer by stanbon(75887)

Question 68158: My problem is 6 (5g + 2) = 30g
Can you help me?
Thanks*

Click here to see answer by stanbon(75887)

Question 68060: Please help me solve the following
�3(10x � 3) + 10(3x � 3) = x � 7
Click here to see answer by ankor@dixie-net.com(22740)

Question 68220: (x+3)(2x-5) and (x+5)(x+4) I'm studying Algebra II and was never taught this. Tank You.
Click here to see answer by ptaylor(2198)

Question 68351: I need help understanding the steps and rules of what to do on this and for any case of these kind of math problems.
-5(6z+2)= or -7(p+2)+7p= I do not know how to combine like terms
Click here to see answer by CrazyMan Jr.(21)

Question 68347: Sarah sells a fruit juice that she makes by mixing together fruit juice concentrate and water. She wants her mixture to contain 30liters of 15% strength juice. How much of the fruit juice concentrate will she need if the concentrate contains 90% juice?
Thanks so much for your help!
Click here to see answer by ankor@dixie-net.com(22740)

Question 68450: When x number of units are sold, the price of each unit (in dollars) is given by p = -x/2 + 75. Find the unit price when the following quantities are sold: 2,7,9,11.
Click here to see answer by funmath(2933)

Question 68570: My Equation is: Ten plus 6 times a number is equal to 5 less than the number?
Anyones help 4 this equation would be greatly appreciated.
Thank You
Click here to see answer by funmath(2933)

Question 68568: My Equation is:The product of 9 and a number plus 17 is equal to -1
If someone could please help me It would greatly appreciated.Thank you
Click here to see answer by ptaylor(2198)

Question 68701: i dont understand these types
-3(-3)(-2 - 5 + |-11|)
Click here to see answer by stanbon(75887)

Question 68909: I need to find the sum of:
x3 minus 3x2y plus 3xy2, minus 2x2y minus xy2 minus y3 and x3 plus 4y3
this is what I think
x3 plus x3
minus 3x2y minus 2x2y
3xy2 minus xy2
minus y3 plus 4y3
this would give me
2x3 minus 5x2y plus 2xy2 plus 3y3
is this correct
(from worksheet from cambridge mathematics 3 unit year 11)
Click here to see answer by Earlsdon(6294)

Question 69036: r=2 s=5 t=.5
Write the following algebraic expression.
Then evaluate the expression for the values given above.

t times the sum of four times s and r

Click here to see answer by bucky(2189)

Question 69333: I need help on mutiplying like terms
the Question is: 2x(3x + y) + 3y (x + 2y)
Click here to see answer by josephballard14(3)

Question 69375: f(x) = 2x-1
find f(-9)
Click here to see answer by bucky(2189)

Question 69895: Would you happen to know how to do a question for instance (4x-5y)-(6x+3y)-(7x+2y)? I got the answer of -9x-10y. I wanna know if you know how to do the solution and how I get the - in front of the numbers. If you can help me it would be greatly appriciated.
Click here to see answer by ptaylor(2198)

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