7.
P = d3/2
When d = 6.76, we have
P = (6.76)3/2 ≈ 17.58
8. Hard to read this...but I think we have
3√x3
____
5√x2
Writing in exponential form, we have
x^(3/3) a^m
_____ using _____ = a^(m - n) we have
x^(2/5) a^n
x ^( 3/3 - 2/5) =
x^(1 - 2/5) =
x^(5/5 - 2/5) =
x^(3/5)