A swimming pool contains 500 gallons and is being drained at a rate of 50 gallons per hour. what is the rate of change, starting rule, and function rule

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Which of these tables represents a non-linear function?

I’m confused on how to work the pie charts