Equation of exponential growth:

Here Y  is the final amount.

a is the initial amount.

r is the rate of change expressed as a decimal, r > 0.

t is time.

a. Write an equation for Camil purchased a rare coin.

                     (Substitute )

                      (Add: )

b.Determine the value of the coin in 5 years.

                   (Substitute )

   (Use exponent calculator:)

              (Multiply: )

a. Write an equation for Camil purchased a rare coin. is .

b. The value of the coin in 5 years is .