Only 25 and 28 are functions.
A function must have only one y value per x value. For 26, the y value of 0 and multiple others have two different y values. For 27, all x values less than 0 have multiple y values.
Answer:
h
Step-by-step explanation:
5(x + 10)?  A.5x + 10 B.5x + 10x C.5x + 50 D.5 + x + 10.