There are 12 pupils in a class. They are each asked whether they have a brother or a sister, 9 say they have a brother, 7 say they have a sister, 2 say they have neither. Fill in the venn diagram

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.