Which statement about √x-5-√x=5 is true?
A) x = –3 is a true solution.
B) x = –3 is an extraneous solution.
C) x = 9 is a true solution.
D) x = 9 is an extraneous solution.

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%