Find the integer values of x that satisfy both of these inequalities. (a) x-5> 3 and 3x +1 <31

(b) 2x+1>7 and 4x - 3 <17

Please give full explanation

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%