Which relation is not a function?

Assessment items item 1 garrett is a member of a movie club. he pays a monthly service fee of $5.75 and $2.50 for each movie he rents. which expression represents how much money he will spend for renting x number of movies a month?

For each proportion find the unknown number x 1/5/8=×/15

What is the value of x in the equation (2)3) (x+6)= -18 a. -36 b. -33 c. -24 d. -18