What is the best description of the relation in item 2? A. a function is one-to-one
B. a function that is many-to-one
C. a function that is one-to-many
D. a relation that is not a function

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?