15. There are 6 boys and 9 girls on the debate team. The coach randomly selects 3 students to participate in a competition. What is the probability that the coach chooses all girls?

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.