College Algebra
posted by Krissy on .
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/y10)/y+(25/y10)
a. 1/y5
b. 1/y+5
c. 6/y+25
d. 1/y+1/5
5.Simplify the compound rational expression. Use either method. (2/a1/3)/(4/a^21/9)
a. A+3/3
b. A3/3
c. 3A/6+A
d. 3a/6a
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 (2x4y)^2 given x=3 and y=1.
a. 100
b. 20
c. 4
d. 4

4. none of the choices are correct
proof: let y = 1
1+(5/y10)/y+(25/y10) = 1 + (5) + 5 = 1
none of the choices produce 1
perhaps you have the brackets incorrect
e.g perhaps the first bracket of (5/y10)
could have been (5/(y10) )
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 secondguess
7. 4x^0+(4x)^0
remember, (anything)^0 = 1
= 4(1) + 1 = 3
8. (2x4y)^2 , when x=3, y=1
= (6 + 4)^2
= 10^2
= 100