is it true that the slope of the line x = -4 is 0

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?

If your teacher tells you to do questions 6 through 19 in your math book for homework, how many questions is that

How do i simply this expression (quadratic formula basis) on a ti-84 or normal calculator?