Answer:
see below
Explanation:
The graph opens upward if the sign of the squared term is positive. If that sign is negative, the graph opens downward. The first three equations open upward; the last opens downward.
The line of symmetry is the value of x that makes the squared term zero. Here, that is x=5 for all equations.
y=2/3(x-5)^2: A, D
y=1/2(x-5)^2: A, D
y=3/4(x-5)^2: A, D
y=-4(x-5)^2: B, D