Graph the equation in the standard window and in the given window. Determine which window better shows

Question:

Graph the equation in the standard window and in the given window. Determine which window better shows the shape of the graph and the x- and y-intercepts.
(a) y = 3x2 - 6
[-4, 4, - 4, 4]
(b)
y = -2x + 24
[-15, 15, -10,30], with Xscl = 3 and Yscl = 5
(c) y = -1/6 x2 + 1/12
[-1, 1, -0.3, 0.3], with Xscl = 0.1 and Yscl = 0.1