Ahh I don't understand these lol. Any help?

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? a) 6 b) 8 c) 14 d) 20

What expression is equivalent to 42x-56y

True or false? a circle could be circumscribed about the quadrilateral below.