X-z=-5
2x+3y+2z=12
x+y+3z=13

Form two equations with y eliminated

Can someone check my answer? you

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%

Graph y = -|x| + 2. click on the graph until the correct one appears.