D) f(x) = (x − q)(x − r)(x + s)(x + t)14 .A 40-foot tall arch with a parabolic shape has a line drawn between the bases of the two
legs of the arch. If the height above the ground, y, of the arch can be written as the function
y(x) = a(x − 20)(x + 20), where x represents the horizontal distance along the line between
the bases from a point on the ground directly under the highest point of the arch, then what
is the value of negative constant a ?
A) −B) −C) −D) –20
15.
The graph of f(x) is shown in the xy-plane above. Which of the following could be the
graph of – [f(x − 2) + 3] ?
A)