Question

A certain forest covers an area of 3900 km2 . Suppose that each year this area decreases by 4.25% . What will the area be after 15 years? Use the calculator provided and round your answer to the nearest square kilometer.

Answer 1

The multiplier for decreasing by 4.25% is 0.9575. To get our answer we times the area by the multiplier to the power of the amount of years:
3900 x 0.9575¹⁵ ( it's to the power of 15 because of the fifteen years)= 2033.042km²
= 2033km² (to the nearest km²)