5.7 mile ride on the community bike ride
Answer:
first one is a and the second one is c
Answer:

Step-by-step explanation:
Given

Required
Simpify
The very first step is to take LCM of the given expression

Perform arithmetic operations o the numerator

Divide the numerator and denominator by 2


The expression can't be further simplified;
Hence,
= 
(64)^3/2 = (sqrt(64))^3 = 8^3 = 512.