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

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 Algebra: Evaluation of expressions, parentheses Solvers Lessons Answers archive Quiz In Depth

 Question 25993: I am trying to help my son with his pre algebra.....but it has been a long time...can you show me how to solve the following: 1/3(p+21)=1/6(p-9) thanks, Rick Click here to see answer by Earlsdon(6287)

 Question 26142: Write an algebraic expression for this statement. Then evaluate expression for n= 12. 3 increased by n ___________;____________ n students placed in 4 equal groups ___________;____________ Thank you! Parent in need of help!! Click here to see answer by stanbon(57387)

 Question 26377: I want to make sure I did this correctly: Add 8a - 6 and 4a + 5 Now I can simplify this equation by doing the first equation like this: 8a - 6 = 2a The second equation I did this: 4a + 5 = 9a Now I can combine these to be: 2a + 9a = 11a Is this the correct method? Click here to see answer by stanbon(57387)

 Question 26376: 6x + 4(3x - 2) = 6x + 2 First I used the distributive process which broke it down to this: 6x + 12x - 8 = 6x + 2 Then I simplified the 6x and 12x which did this: 18x - 8 = 6x + 2 Then I had to get the x's on one side and the numbers on another: 18x - 6x = 12x 6x - 6x = 0 So the formula looked like this: 12x - 8 = 2 From here I became stuck with this. I did not know the next step. Could you please give me a hand? Thank you so much! Click here to see answer by longjonsilver(2297)

 Question 28040: how would a question like x^2-4x-21=0 be solved? Click here to see answer by stanbon(57387)

 Question 28466: 4/3 ( 4x-2) - 2(3x+4) 3 x 4 ( 4x-2) - 2(3x+4) --- 3 4( 4x-2) - 2(3x+4) 16X - 8 - 6X - 8 10X - 16 Did I solve this correctly? Click here to see answer by askmemath(368)

 Question 29276: I am helping my son with pre alegebra, his book is ridiculous for examples: These are what I need help on. 1. Simplify: -(-{-[-(2)]}), 2. Simplify (4)(-3), 3. Simplify: (-3)(-3)(-3)(-3). Evaluatexy-y, if x=6 and y=-5, evaluate -ab-a, if a=-4 and b=-5. Click here to see answer by longjonsilver(2297)

 Question 29654: The expression xyz means x times z. true or false Click here to see answer by Earlsdon(6287)

 Question 29652: A variable expression cotains operations, numbers, variables. true or false Click here to see answer by ikdeep(226)

 Question 29655: The volume of a box is length times width times height. need to write expression for words Click here to see answer by sdmmadam@yahoo.com(530)

 Question 29722: Can anyone solve this problem ?????? 1/4 x 8/9 x -3/5 = ? Click here to see answer by Cintchr(481)

 Question 28736: I have looked everywhere in trying to solve these problems! How would you solve these problems step by step?¿ 12-n/5 = 21-n-29 AND 21 = 1 -(4a+2) Click here to see answer by checkley71(8403)

 Question 30578: 3h+2 for h =10 2x for x = 15 4p - 3 for p = 20 3x +17 for x = 13 Click here to see answer by ikdeep(226)

 Question 30577: 3h+2 for h =10 2x for x = 15 4p - 3 for p = 20 c for c = 56 7 Click here to see answer by AlgebraGirl08(3)

 Question 31757: I am an old student in College Algebra and I have tried and tried to solve these Compositions of Functions. Your help with the following problems would be greatly appreciated: Find g(f(x))if g(x)=sqrt(2x+3) and f(x)=4x-3. Find h(f(x)) if h(x)=1/x+2 and f(x)=4x-3 Any thing you can provide would be a great assistance to an old woman. Click here to see answer by venugopalramana(3286)

 Question 31892: I'm not quite sure how to figure this one out. I tried: 6 = 24 ÷ g 6x24 = 24 ÷ g x 24 144 = g Click here to see answer by mbarugel(146)