If the ordered pair (-5/2,y) lies on the graph of y=7-2x, find the value of y a) 2 b) 19/2 c) 12

Of 400 people at the school carnival, 95% are students and the rest are teachers. a. how many students are at the school carnival? b. if 55% of the students at the school carnival are boys, how many are girls? c. how many teachers are at the school carnival? d. if 35% of the teachers are male and the rest are female, how many female teachers are at the carnival?