12 blue car. 10 black cars 18 white cars. 6 red cars

what is the ratio of blue cars to black cars?

A. 5:6
B. 12:5
C. 6:5
D. 6:10

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.