Need quick using all my points a best-fit line has the equation y = 37.4296x + 4.99, which models the cost y of ordering x video games from an online store. predict the cost of ordering 3 video games. a) approximately $117.78 b) approximately $108.28 c) approximately $117.28 d) approximately $114.27

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%