How the hell do I do this ‍♀️

Olivia uses the work below to determine 55% of 720 which explains the error in olivia’s solution

Acyclist bike x distance at 10 miles per hour .and returns over the same path at 8 miles per hour.what is the cyclist average rate for the round trip in miles per hour ?

Over the course of a month, a person's weight decreases. what type of relationship is this? a. positive relationship