Exp. Function

Question

At the beginning of an environmental study, a forest covered an area of 1500km2. Since then, this area has decreased by 1.1% each year. Let t be the number of years since the start of the study. Let y be the area that the forest covers in km2. Write an exponential function showing the relationship between y and t. 

Answer 1

 1.1% = 0.011

 

y = 1500(1 - 0.011)^t = 1500(0.989)^t