Can someone explain what the answer and tell me if I got it the answer correct?

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

If a piece of wood with a length of five feet is cut into six equal pieces, what is the length of each piece?

Which is the standard form of the equation of the parabola that has a vertex of (-4,-3) and a directrix of x = 2? (x+3)2 = 24(y+4) (y+3)² = 24(x-4) (y+3)² = -24(x+4) (x+3)2 = -24(y+4)