Plz very ! first to answer will be mark as the also explain the steps that you took and which letter is the answer.

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 value of x. round the length to the nearest tenth

Solve each quadratic equation by factoring and using the zero product property. 10x + 6 = -2x^2 -2