Enter the correct answer in the box. Consider this expression.

x^2 + x - 72

Replace the values of a and b to rewrite the given expression.

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?