How do i find the unit rate of $7.96 for 5 pounds?

Ahome improvement store rents it’s delivery truck for $19 for the first 75 minutes and $4.75 for each additional 1/4 hour. if a customer rented the truck at 11: 10 am and returned the truck at 1: 40 pm the same day, what would his rental cost be?

Match each function with its rate of growth or decay

Idon’t understand! use slope intercept form to solve: through: (2,5) slope= undefined