For this case, we have that by definition, the graphs of the quadratic equations that open downwards fulfill the following:
Let:
[tex]ax ^ 2 + bx + c = 0[/tex]
The coefficient "a" is negative. That is to say:
[tex]a <0[/tex]
Then, the equations:
[tex]v = 60x-15x ^ 2\\v = -5-2x ^ 2[/tex]
opens downward
Answer:
Option A and C
