Astudent is solving the equation 2x - 1 = 16x + 2
step 1: 2x - 1 = 16x + 2
step 2: 2x - 1 = (24)x + 2
step 3: 2x - 1 = 24x + 8
which is the next step?
a. 2(x - 1) = 4(x + 2)
b. x - 1 = 4x + 8
c. x - 1 = x + 2
d. x -1 = -(4x + 8)

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.