Use the Product Rule to Simplify Square Roots
-The Average $y = 2.9 \sqrt { x } + 20.1$

Use the Product Rule to Simplify Square Roots
-The average height of a boy in the United States, from birth through 60 months, can be modeled by $y = 2.9 \sqrt { x } + 20.1$ 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 36 months of age and a child 25 months of age?

A) $2.9$ inches
B) $43.1$ inches
C) $17.4$ inches
D) $4.9$ inches