Consider the algebraic expression: x + 2 – 5 + 3x Use the algebra tiles interactive to collect like terms. How many x tiles represent the simplified expression? PLS HURRY I AM TIMED also thank you

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%