Exercise 28 Page 119

Recall that the coefficient of the quadratic term determines the amount of stretch of a parabola. In fact, if we use y=ax^2, |a| determines the amount of stretch. The larger the value of |a|, the more vertical stretch there is.

Function	|a|	Ranking
g(x) = - x^2	|-1| = 1	3
h(x) = 5/3x^2	|5/3 | = 5/3	2
f(x) = - 4.5x^2	|- 4.5| = 4.5	1

Recall, 53 ≈ 1.67, which is between 1 and 4.5.