What is the slope of a line perpendicular to line a?

7/4
-4/7
4/7
-7/4

Adding and subtracting matricesfind the value of each variable. x = and y = would

Find percent notation for 0.008 0.008=

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%