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

Tutors Answer Your Questions about expressions (FREE)

Question 1196220: Find A, B and C if
Click here to see answer by ikleyn(52831)

Question 1196238: In a survey of 120 consumers conducted in a shopping mall, 76 consumers indicated that they buy Brand A of a certain product, 66 buy Brand B, and 48 buy both brands. How mar consumers participating in the survey buy the following? (a) at least one of these brands consumers
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Question 1196329: 10+4*12-6=34
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Question 1196329: 10+4*12-6=34
Click here to see answer by MathTherapy(10555)

Question 1196715: Felipe wants to earn more than $45 trimming trees. He charges $6 per hour and pays $3 in equipment fees. What are the possible numbers of hours Felipe could trim trees?
Use T for the number of hours.
Write your answer as an inequality solved for T.
Click here to see answer by ikleyn(52831)

Question 1196854:
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Question 1196936: Find the complete or particular solution on the following differential equation:
; x=1/2, y=0
Answer:
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Question 1196937: In the following differential equation, test for exactness and determine the solution:

Answer:
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Question 1197259: A condidate was to submit 15 from a certain number but mistakenly added 25 and her answer was 145. What is the percentage error
Click here to see answer by ewatrrr(24785)

Question 1197259: A condidate was to submit 15 from a certain number but mistakenly added 25 and her answer was 145. What is the percentage error
Click here to see answer by ikleyn(52831)

Question 1196935: Find the complete or particular solution on the following differential equations:
y'-2y=y^2 ; y=3 when x=0
Answer: 5y=3(y+2)e^(2x)
Click here to see answer by Edwin McCravy(20060)

Question 1197345: The salary of a clerical officer is #2300 per anum.A rise of #150 is given at the end of each year. Find the total money earned in 12 years

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Question 1197520: When I see a question like this:8(6+7) I don't understand. What am I supposed to do? I can understand 8+(6+7) or 8/(6+7) but there is no symbol between the 8 and the (6+7) so I am lost.
Click here to see answer by MathLover1(20850)

Question 1197627: Use properties of logarithms to condense the logarithmic expression. Write the expression as a single logarithm whose coefficient is 1. Where possible, evaluate logarithmic expressions

1/4 [3ln(x+8)−lnx−ln(x^2−49)]

Click here to see answer by greenestamps(13203)

Question 1197805: Given a number n, which expression best represents the sum of twice n and 5? I understand that the answer is 2n + 5, I just would like an explanation to why this would be the answer.
Choices: A. 2(n + 5). B. 2n+5. C. 5(n+2). D.5(5+n)

Click here to see answer by MathLover1(20850)

Question 1198438: how old will he be ten years from now?
Click here to see answer by Alan3354(69443)

Question 1198438: how old will he be ten years from now?
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Question 1198437: how old will he be ten years from now?
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Question 1198655: the average of four number is 40. the third number is 12 more than the second, the fourth is 8 less than the first. find the number?

Click here to see answer by Alan3354(69443)

Question 1198685: Find an expression equivalent to 25x^2+144+27x^3+125y^3
Click here to see answer by MathLover1(20850)

Question 1198802: How do you translate this algebraic expression : Ten more than thrice a number x less than 12? Is it 12-3x+10 or 12-(3x+10) ?
Click here to see answer by mccravyedwin(408)

Question 1198734: Simplify the following expression as muc as possible.
(25x^3-4x/6x^6+6x^5)(6x^2-2x-8/25x^2-4)
Click here to see answer by MathLover1(20850)

Question 1198978: please help me solve this equation:
I have tried to solve it like this;
But according to my teacher, the answer I get, =a^2+4a-1, is wrong.
I do not understand what I have done wrong.
Click here to see answer by mccravyedwin(408)

Question 1199112: Find an expression equivalent to 25x^2+144+27x^3+125y^3.
One of the following expressions is the correct answer. Which one is correct?
A) (5x+12)(5x-12)+(3x+5y)(3x^2-15xy+5y^2)
B) (5x-12i)(5x-12i)+(3x-5y)(9x^2+15xy+25y^2)
C) (5x-12)(5x-12)+(3x-5y)(3x^2+15xy+5y^2
D) (5x+12i)(5x-12i)+(3x+5y)(9x^2-15xy+25y^2)
Click here to see answer by greenestamps(13203)

Question 1199429: What is the smallest possible value of the multivariable function
f(x,y) = 2x^2 +y^2 -2xy+6x-1
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Question 1199427: Solve for x in the equation cos x - cos 2x = 1/2 where x e (0 degree, 180 degree)
Click here to see answer by Alan3354(69443)

Question 1199448: Find all the integer solutions for the expression
sqrt a + sqrt b = sqrt 2023
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Question 1199426: let the roots of the equation x^3 -2x^2 -3x-7=0 be r, s, and t. find the equation whose roots are r^2, s^2 and t^2
Click here to see answer by math_tutor2020(3817)

Question 1199477: Question : simplify : x-[x-(y-z)]-z

My work:
-1(y-z) I took the - as -1 and multiplied it by (y-z)
x(-y+z) expanded and multiplied by x
x--xy+xz-z added the x- and -z (outside of brackets)
x+xy+xz-z final answer (which is wrong)

actual answer :y-2z
how am I supposed to work it out then ?
thank you for your attention.

Click here to see answer by Edwin McCravy(20060)

Question 1199531: (-5ab)3

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Question 1199531: (-5ab)3

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Question 1199801: Simplify the following algebraic fraction :
(a^2-3a-4)/(a^2-4) x (2-a-a^2) /(a^2-1)
answer: (4-a)/(a-2)
how is this worked out ?
Click here to see answer by josgarithmetic(39623)

Question 1199800: simplify this algebraic fraction:
(y^2-y-6)/(y^2-25) ÷ (3-y)/(5-y)
answer : (y+2)/(y+5)
how is this simplified ?
Click here to see answer by josgarithmetic(39623)

Question 1199800: simplify this algebraic fraction:
(y^2-y-6)/(y^2-25) ÷ (3-y)/(5-y)
answer : (y+2)/(y+5)
how is this simplified ?
Click here to see answer by MathTherapy(10555)

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