There are 38 students in Mr. Reynolds math class and 20 are boys. If a student is selected at random what is the probability that a girl is selected?Give the answer as a fraction in simplest form.

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%

If (x-2) 2= 49, then x could be a. -9 b. -7 c.- 2 d. 5 e.9

Solve for x and y: 217x + 131y = 913; 131x + 217y = 827