Please help me with these two

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.

Find the length of the radius of a circle with the center at -7+2i and a point in the circle at 33+11i

Find the center of the circle that can be circumscribed about efg with e(4,4) f(4,2) g(8,2)