F (x) = (x + 5)*(x - 9)(x + 1)

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%

In which direction does the left side of the graph of this function point? f(x) = 3x3 - x2 + 4x - 2

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