Answer:
A
Step-by-step explanation:
you can find the vertex of each equation and then compare to the graph
x = -b/2a
A) x = -(-9)/2(1); x = 9/2 or x = 4 1/2
plug 4 1/2 into equation as 'x' to find 'y'
y = (9/2)² - 9(9/2) + 20
y = 81/4 - 81/2 + 20
y = 81/4 - 162/4 + 80/4
y = -81/4 + 80/4
y = -1/4
the only option with a vertex at (9/2, -1/4) is A
