Multiple choice plz plz you! : )

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.

Tell whether the two rates form a proportion

Use the quadratic function to predict f(x) if x equals 8. f(x) = 25x2 − 28x + 585