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How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

For f(x)=2x+3 and g(x)=x^2- 8 find (f+g) (x)

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%