The amount of pollutant, measured in parts per million, in Pine Lake, can be modeled by the function A(t) = 28e^ −0.16t, where t is the number of years since a program to clean up the lake began. Approximately how long will it take for the amount of the pollutant in Pine Lake to reach 7 parts per million?

PLEASE MARK BRAINIEST

d (4) = 68

This means that after 4 hours Joanna cycled for 68 miles total

Step-by-step explanation:

For this case we have the following equation:

The variables are:

t: time in hours

d (t): distance traveled in miles.

We evaluate the distance traveled after 4 hours.

So we have that for t = 4: