The equation -5x^2+72x+378 models the number of students enrolled in a school where x is the number of years since the school first opened in 1990. how many students did the school have when it opened?

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To describe a sequence of transformations that maps triangle abc onto triangle a"b"c", a student starts with a reflection over the x-axis.how should the student complete the sequence of transformations to map triangle abc onto triangle a"b"c"? plz

If f(x)=2x-6 and g(x)=3x+9, find (f-g)(x)