A shirt that originally cost $64 was is marked up %20 what is the selling price

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%

Find the missing dimension! need asap! tiny square is a =3025 in ²

Can you me find the slope! (30 points)