Answer: a+-5 x 4 (I THINK)
Step-by-step explanation:
Considering the vertex of the graph, it is found that the quadratic function that is the best model for the data is given by:

<h3>What is the equation of a quadratic function given it’s vertex?</h3>
The equation of a quadratic function, of vertex (h,k), is given by:

In which a is the leading coefficient.
Researching the problem on the internet, it is found that the vertex is at point (4,800), hence h = 4 and k = 800.

It has a value of y = 0 at x = 6, hence:


Thus, the model is:

More can be learned about quadratic functions at brainly.com/question/24737967
I'm not sure if it's right, but I think the answer is 648.
Answer:
I beleive it is A or C. But for me I'd choose C
Step-by-step explanation:
I hope this is right.