Solve the Problem. -The Average Height of a Boy in the United States

Multiple Choice

Solve the problem.
-The average height of a boy in the United States, from birth through 60 months, can be modeled by y = 2.9x + 20.1 where y is the average height, in inches, of boys who are x months of age. What would be the expected difference in height between a child 25 months of age and a child 16 months of age?

A) 43.1 in.
B) 14.5 in.
C) 4.9 in.
D) 2.9 in.