Acertain forest covers an area of 4200km^2 suppose that each year this decreases 8.5% what will the area be after 5 years

Step-by-step explanation:

Given: A certain forest covers an area =

The rate of decrease = 8.5 % = 0.085

The exponential decay function is given by :-

, where A is the initial amount , r is the rate of decay and t is the time.

Now, the area after 5 years is given by :-

Hence, the area after 5 years =

yes because there is exactly one y value for every x value

for function there can't be more than one value for every x value