Question

A scientist is performing an experiment with a certain type of mold which is spreading every quarter of an hour. The function below represents the area covered by the mold after t hours.

The area covered by mold ___ by ___ % ___.

first blank: decreases, increases
second blank: 104, 4, 17, 8
third blank: every 15 minutes, every hour, every 4 minutes, every 30 minutes

fill in each blank with one of the options. Thank you!!

Answer 1

i believe its every hour not 15 minutes

Explanation:

Answer 2

"The area covered by mold increases by 4 % every 15 minutes."

Explanation:

Since the mold is "spreading", the area is obviously, increasing.

By how much???

We can look at the function. The increasing factor is (1.04). The increasing factor is the part OVER 1, we have 4 units OVER 1, so it is increasing by 4%.

Since, the mold is spreading every QUARTER OF AN HOUR, this means 1/4th of an hour.

An hour is 60 minutes, 1/4 of 60 = 15 minutes. Hence, it is increasing every 15 minutes.

To complete the statement:

The area covered by mold increases by 4 % every 15 minutes.