Mr. jones's algebra class has too many students in it. if the class were split exactly in half to form 2 new classes, each class would have no more than 18 students in it.

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?