Write each sum or difference in simplest form.
5/12-3/20=

Asphere has a diameter of 10 in. what is the volume of the sphere?

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%

What is the solution to this system of equations? y= 2x - 3.5 x - 2y = -14