Given vectors a = (5,1), b=(-4,-6), c = (1,7), and d (3,-3), find the sum of all four vectors numerically and then find the sum graphically.

Heather is writing a quadratic function that represents a parabola that touches but does not cross the x-axis at x = -6. which function could heather be writing? fx) = x2 + 36x + 12 = x2 - 36x - 12 f(x) = -x + 12x + 36 f(x) = -x? - 12x - 36