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December 19, 2014

December 19, 2014

Posted by **Krissy** on Tuesday, January 15, 2013 at 9:35am.

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 -
**Reiny**, Tuesday, January 15, 2013 at 10:36am4. 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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