Felicity babysat 2 hours each night for 10 nights. she earned a total of $180 babysitting. felicity wants to calculate her hourly rate. how much did felicity earn per hour babysitting?

Charlie is at an amusement park that has 18 different rides. each ride costs $1.75. the function c(r) = 1.75r represents the total amount of money that charlie will spend if he goes on r rides, but he never goes on the same one more than once. what domain and range are reasonable for the function?