If a = m² what is the value of a when m = -3?

If f(x)=-x^2+6x-1 and g(x)=3x^2-4x-1,find(f+g)(x)

50 plz, given the system of equations, match the following items. x + 3 y = 5 x - 3 y = -1 a) x-determinant b) y-determinant c) system determinant match the following to the pictures below.

The given diagram shows the parts of a right triangle with an altitude to the hypotenuse. using the two given  measures, find the other four.