Darius has at least $15 more than his big brother. Darius's big brother has $72. How much does Darius have?

If f(x)= 3x+6 which of the following is the inverse of f(x)

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.

Find the missing dimension extra points