What is 40% of 80% i need with this

A(t)=728(1+0.04)^t how much money did aditya originally invest

5/6+7/8what is the answer sealsdbdbshd

Let f(x) = 3 − x . find the average rate of change of f(x) from x = a to x = a + h and simplify your answer so that no single factor of h is left in the denominator.