Aspring has a natural length of 20 cm. if a 30-n force is required to keep it stretched to a length of 38 cm, how much work w is required to stretch it from 20 cm to 29 cm? (round your answer to two decimal places.)

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.