Graph y=-2x-3 using values other and 0 and 1 as value for x

In the final round of trivia competition, contestants were asked to name as many states that begin with the letter m as they could in 15 seconds. the bar graph shows the number of states the contestants were able to name. how many contestants participated in the final round of the competition?

Let r = 3. what is the value of r + 58?

The standard deviation for a set of data is 5.5. the mean is 265. what is the margin of error?