Tell how to undo each operation and explain why it works. adding 28. dividing by 17

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%

Ann and betty together have $60 ann has $9 more than twice betty’s amount how much money dose each have

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6