QR = 82 ; PR = 63 ; PQ = 29, tan __?__ = 29 / 82

Trig please help!!

Which point is a solution to y s 4x + 5?

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%

Which of the following is not a subset of {1,2,3}?