book Maths Puzzle Numerical Ability

I saw a similar problem posted but am not sure of the solution to this one. Can someone help?
16^3/2
I got the answer as 6, because 16 = 4^4 and 4 times 3/2 = 12/2 =6 am I right? If not can someone please explain? Thanks.

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book Other Question

reduce to lowest terms

neg 2X minus 8 over x squared plus 2x minus 8
please find the lowest common denominator of 3/4 and 5/8 thank you

a. 32
b. 16
c. 8
d. 4