Which of the following expressions is equivalent to 50-30y?

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?

The vertices of a triangle are a(7,5), b(4,2), c(9,2). what is m

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab