If m<10=77,m<47 and m<16=139, find the measure of each missing angle

At which value in the domain does f(x) =0?

Which of the following answers is 7/9 simplified? 7/9 2/9 11/9 2/7

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%