3. Keith applies a new brand of fertilizer to his grass. He
finds that the rate at which the grass grows can be
modeled by a linear function. He observes that the rate of
growth is 1 centimeter every 4 days. After 20 days, he
measures the height of the grass to be 11 centimeters.
What is the initial height of the grass? *

A) 5 centimeters

B) 6 centimeters

C) 7 centimeters