Andy scuba diving he starts at sea level and then descend 18 feet in 1 1/2  how many feet does he descend each minute

Mat bought a phone for $100. he has to pay $30 per mouth. if he has paid $640 in total, how many mouth has he had the phone?

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1

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.