Arthur deposits US dollars P into a savings account at time 0, which pays interest at a nominal rate of j, compounded semi-annually. In the last 6 months of the 7th year, he earns interest that is 2.4 times what he earned in the last 6 months of the 4th year. Calculate j​

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.