The answer is D. And this is how you do it as follows bellow: First form the scientific notations in decimal form 4 x 10^-2= 0.04 Next is 2 x 10^-4= 0.0002 And now compare the decimal numbers and order them from least to greatest: 0.0002, 0.004, 0.04, 0.042, 0.24 , which is the same thing as choice D.