Answer
(a) red curve.
(b) blue curve.
(c) green curve.
(d) See explanations.
Work Step by Step
(a) Graph $y=x^2$ as shown in the figure (red curve).
(b) Graph $y=3x^2$ as shown in the figure (blue curve).
(c) Graph $y=\frac{1}{3}x^2$ as shown in the figure (green curve).
(d) For $y=ax^2$, the greater the value of $a$, the narrower the parabola, while the smaller the value of $a$, the wider the parabola.
