What is the absolute value of 2 and -2?

Which value of c would make he following expression completely factored? 8x+cy

What is 20+(5 x 2/5 )+ 3 show your work

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%