James had 5 dozen marbles. he gave 1/5 of
them to his friend mark and 1/5 of them to his
friend michael. what fraction of marbles did he
give away?

a. 1/5
b. 2/5
c. 3/5
d. 4/5

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.