Question

Which relation is not a function?

(A) Month Profit
Jan. $150
Feb. $400
Mar. $430


(B) Month Profit
Jan. $150
Feb. $400
Mar. $430


(C) Month Profit
Jan. $150
Feb. $400

(D) Month Profit
Jan. $400
Feb.
Mar.

Answer 1

The second option.

Explanation:

A function should have each input mapping to only one output. The second option does not follow this because there are two arrows going out of March.

Answer 2

b is not function because domain is associated to two components