Answer:

Step-by-step explanation:
Hi there!
Because we're given the vertex of the parabola, we can determine its equation in vertex form:
where the vertex is 
Plug in the vertex (0,0)

Now, we must solve for a. Plug in the given point (-2,3) and solve for a:

Therefore, the value of a is
. Plug this back into
:

I hope this helps!
Answer:
a= -12
Step-by-step explanation:
because
Quotient means division, so we have y/4 - 3.
If y = 20,
20/4 - 3 = 2
Answer is 2.