An air conditioning technician charged Robert $77.25 to repair his air conditioning system after 3 hours of work. The technician charged the same rate for each hour of work. Which diagram represents the constant rate of change for this situation?

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.