A cookie factory uses 9 bags of flour in each batch of cookies. The factory used 7 1/5 bags of flour yesterday. How many batches of cookies did the factory make?

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.