Find the solution of the differential equation that satisfies the given initial condition. y′ tan(x) = 9a + y, y(π / 3) = 9a, 0 < x < π / 2

David estimated he had about 20 fish in his pond. a year later, there were about 1.5 times as many fish. the year after that, the number of fish increased by a factor of 1.5 again. the number of fish is modeled by f(x)=20(1.5)^x. create a question you could ask that could be answered only by graphing or using a logarithm.