Which equation represents the polar form of x2 + (y + 4)2 = 16? r = 8sin(θ)
r = 8cos(θ)
r = –8sin(θ)
r = –8cos(θ)

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.