420, 84, 16.8, 3.36,... What is the explicit rule for this sequence?
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What is the name used to describe a graph where for some value of x, there exists 2 or more different values of y?

Which of the following points is collinear with (-2,1) and (0,3)

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%