Question

Exponential growth is modeled by the function A=Pe^((rt)

Answer 1

To find k, do i just plug in 500 for A and 0 for t?

Answer 2

P is is the present value.
At t = 0, the time starts, and P = 500.

Answer 3

At t = 1, A = 1200, but P will always be the initial value P = 500.
Use the data from t = 1 to find k.
then use the value of k you find to find A at t = 4.
Finally, use the k value you found with A = 8000 to solve for t.