Urgent ! paying all my points! izzy can run 2 and 1/4 miles in 15 minutes. julia can do 3 and 3/4 miles in 20 minutes. ( 1/4 hour = 15m and 1/3 hour = 20m )

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?