What is the area of this cross section of this rectangular prism? Enter your answer in the box.

10 in.

16 in.

16 in.

The hypotenuse of a 45 -45 -90 triangle measure 7 square root 2 units

How to do this , and can some one explain

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%