Which expression is equivalent to 2a−5b+3c? please anyone please help with this 1. 3c−5b+2a
2. 2a−3c+5b
3.5b−2a+3c
4.2a+5b−3c

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%