9. D because it fits the description when it is graphed. 11. D because it has the correct vertex, which is (1.5, 4.75). 12. f(x)=-4(x-2)²+16 works with the table and provided graph! 13. 0 isn't a zero for f(x), so B is correct (the zeros are 1/2 and 4). 14. The width is about 3.831. 15. The answer is B because the equation for a parabola in this form is: f(x) = (x - r₁)(x - r₂)
Every one of these except for 15 was solved using desmos, a graphing calculator.
