Which of these rational numbers is also an integer? 24, 0.24, 42, or 2.4

What is the slope simplify your answer and write it as a proper fraction, improper fraction, or integer

What is the length of the unknown leg in the right triangle ?

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%