Can someone help me answer these questions?

#10 Find the vertex and x and y-intercepts 1) f(x) = x2 - 4x 2) f(x) = x2 - 3x + 4 3) f(x ) = 1 - X2 4) y = x2 - 2x - 3 5) y = 2x2 + 3x - 2 6) y = -x2+ 6x + 2