College Algebra

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I have a few more questions that I'm not understanding. Its multiple choice however I would appreciate a breakdown on how to solve.

4.Simplify the compound rational expression. Use either method. 1+(5/y-10)/y+(25/y-10)

a. 1/y-5
b. 1/y+5
c. 6/y+25
d. 1/y+1/5


5.Simplify the compound rational expression. Use either method. (2/a-1/3)/(4/a^2-1/9)

a. A+3/3
b. A-3/3
c. 3A/6+A
d. 3a/6-a




7.Use the properties of exponents to simplify the expression. Write the answer using positive exponents only
-4x^0+(-4x)^0

a. 0
b. -8
c. -2
d. -3

8.Evaluate (2x-4y)^2 given x=3 and y=-1.
a. 100
b. 20
c. 4
d. -4

  • College Algebra -

    4. none of the choices are correct
    proof: let y = 1
    1+(5/y-10)/y+(25/y-10) = 1 + (-5) + 5 = 1
    none of the choices produce 1
    perhaps you have the brackets incorrect
    e.g perhaps the first bracket of (5/y-10)
    could have been (5/(y-10) )

    5. same thing in this one
    you have a+3/3
    why didn't they just say a + 1 ?
    or was it (a+3)/3

    Hard to second-guess

    7. -4x^0+(-4x)^0
    remember, (anything)^0 = 1

    = -4(1) + 1 = -3

    8. (2x-4y)^2 , when x=3, y=-1
    = (6 + 4)^2
    = 10^2
    = 100

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