Whats the volume of a cylinder that’s has a 3in radius and 12 in hight

Need this asap if anyone can i would be very grateful. if you could show workings that would really

Explain why the factor 1.5 is broke. into two numbers in the model.

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.