+218 Every student in my school is in either French class or Spanish class, or both. Let x be the number of students in French class, y be the number of students in Spanish class, and z be the number of students who are in both classes. Find an expression in terms of x, y, and z for how many students there are in my school.
+37146 x+y - z you have to subtract z from the total becuase you count them twice when you add x and y ....
