How do you write 44.5 in scientific notation

If f(x) = 3-2x and g(x) =1/x+5 to what is the value (f/g)(8)

Given this information, which expression must represent the value of b?

The first-serve percentage of a tennis player in a match is normally distributed with a standard deviation of 4.3%. if a sample of 15 random matches of the player is taken, the mean first-serve percentage is found to be 26.4%. what is the margin of error of the sample mean? a. 0.086% b. 0.533% c. 1.11% d. 2.22%