Solve the equation. check your solution. 8=m-7

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%

Me complete this proof! prove that a quadrilateral is a square. me with the steps for this proof.

Find the vertex for the parabola given by the function ƒ(x) = −3x2 − 6x.