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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.

 Apr 14, 2019
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x+y - z      you have to subtract z from the total becuase you count them twice when you add x and y ....

 Apr 15, 2019

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