I need to know if 76543•9-5=688882 is a conjecture based off 3•9-5=22

43•9-5=382

543•9-5=4882

6543•9-5=58882

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 distance between point a and b

The tile along the edge of a triangular community pool needs to be replaced? ?