The track and field coach records Ian's 400-meter race times during several practices. How much greater was the percent of change from practice 1 to practice 2 than from practice 2 to practice 3? Round to the nearest tenth.

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.