Determine between which two consecutive integers the real zeros of the given function are located on the given interval

The amount spent on food and drink by 20 customers is shown below what is the modal amount spent ?

Factor the polynomial by its greatest common monomial factor.

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?