Writing an equation that models exponential growth or decay

Question

In 2000, a forest covered an area of 1500km^2. Since then this area has decreased by 5.25% each year. Let t be the number of years since 2000. Let y be the area that the forest covers in km^2. Write an exponential function showing the relationship between y and t.

Answer 1

The equation is

y = 1500(0.9475)^t