Question

A certain forest covers an area of
3700 km^2
Suppose that each year this area decreases by 3.5% What will the area be after 12 years?

Answer 1

after 1 year it is 3700 x 96.5% left.
after 2 year you have [3700 x 96.5%]96.5% left. That is 3700 [(96.5%)^2]
after 3 years you have 3700[(96.5%)^3] left
after n years you have 3700[96.5%)^n] left.