Which relation is a function? a. x −2 0 0 2 4 y 4 3 4 4 6 b. x 3 5 7 10 14 y 9 6 9 2 3 c. x −3 2 2 4 6 y 2 1 8 5 3 d. x −6 −1 1 1 6 y 0 6 2 −3 4

Option a is not a function because for x = 0, y = 3 and 4.
option b is a function.
option c is not a function because for x = 2, y = 1 and 8.
option d is not a function because for x = 1, y = -3 and 4

The answer is all about the number 4

She should use 12/3 to measure