What is the square root of negative 169 ?

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?

Given the following statements, which is the best

Which value would be a solution for x in the inequality 47-4x< 7