The difference of three times a number n half the number is 60

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%

5x−4≥12 or 12x+5≤−4 can you with this problem

An 18% discount on a watch saved a shopper $72. find the price of the watch before the discount