13. justin generously lends $500,000 to his friend, jamie. however, being a maleficent businessman, he charges jamie interest at 8.6 % per annum compounded quarterly. how much will jamie owe justin after 25 years? what is the accumulated interest? [3 marks]

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.