Find the constant if proportionality of the line then find the slope of the line then write a equation ( hurry )

Which statement about the graph of y = 8(0.25)^2

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.

Which of the following pair(s) of circles have las a common external tangent? select all that apply. a and b a and c b and c