9. The function h(t) = 150 - 4t represents the height of a person repelling downa building for the first time where t is measured in minutes and h is measured in
feet above the ground. How high would the person be one half hour after
beginning his descent?

30 feet

Step-by-step explanation:

Hello!

Half an hour is 30 minutes, so that means we are asked to find h(30).

Solve for h(30):

The person would be 30 feet above the ground in half an hour.

30 ft

Step-by-step explanation:

Half an hour is equivalent to 30 minutes.

Thus, h(t) = 150 - 4t becomes h(30 min) = 150 ft - 4(ft/min)(30 min) = 30 ft

step-by-step :