Find the rate of growth after 8 hours. (round your answer to three decimal places.)

The problem ask to calculate the growth rate after 8 hours base on the statement that you give. So with the data given, where as the population would be grow in 20 minutes, the possible growth rate in 8 hours would be calculates as 65X8^tXln8. I hope you are satisfie with my answer and feel free to ask for more 

When y = - 1 , x = 1

When y = 0 , x = 2

Thus the equation is :

y + 2 = x