Seven less than nine times s equals twenty

Brent wants to know what is 5 x 1/2

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

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%