Question

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 3 days.

After 18 days, he measures the height of the grass to be 8 centimeters.

The initial height of the grass was ______centimeters tall.

Answer 1

medal and fan

Answer 2

Let h be the initial height of the grass

Every 3 days, the grass grows 1 inch.

The rate of change is 1/3 which represents a 1 inch increase in height per 3 days of time.

y represents the height of the grass at time x days.

y = h + (1/3) * x

Answer 3

Look at the point (18, 8) which means 18 days results in 8 inches of growth.

y = h + (1/3) * x

8 = h + (1/3 * 18)

Solve for h and you will get the initial grass height. @muneeb180

Post what you get, okay?

Answer 4

lol gotta love the study island stuff.... im doing it late rn soo yea rushing to get them