Which of the following sets of ordered pairs represents a function?
A.
{ (-12, 9), (-15, 9), (-5, -9), (-12, -9) }
B.
{ (9, -9), (-9, -5), (9, -7), (-9, -6) }
C.
{ (14, -3), (14, 0), (14, -1), (14, -1) }
D.
{ (-9, 9), (-5, -9), (-7, 9), (-6, -9) }

Step-by-step explanation:

This is super easy. A function can't have two inputs (x side)

A: -12 and -12

B:9 and 9 or -9 and -9

C: 14 and 14

D: there all different numbers in the x column so it's D hope it helps!

the number of the people going.

step-by-step explanation:

the cost to buy one movie ticket is $7. if the total cost for the movie is a function of how many people go, then the input is : the number of the people going.