Auniversity of florida student earns $15 per day delivering advertising brochures door-to-door, plus 75¢ for each person he interviews. how many people did he interview on a day when he earned $57?

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.