Explain whether 0.4 x 10-5 is written in scientific notation. Choose the correct answer below.
O A. No because the exponent is negative.
O B. No because 0.4 is not between 1 and 10.
O C. The number 0.4x10
-5
is written in scientific notation.
O D. No because the exponent is not an integer.

(ANSWER QUICKLY)

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.