Use the drop-down menus to describe the key aspects of the function f(x) = –x2 – 2x – 1.
The vertex is the .
The function is increasing .
The function is decreasing .
The domain of the function is .
The range of the function is .

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%