Geometry, please answer question ASAP

What is the length of the missing leg in this right triangle? 18 mm 24 mm 26 mm 32 mm

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 is the graph of this function 3 square root of x plus one if