Answer:

Step-by-step explanation:
Vertex form of a quadratic equation;

Vertex of the parabolas (h, k)
The vertex of the parabola is either the minimum or maximum of the parabola. The axis of symmetry goes through the x-coordinate of the vertex, hence h = -3. The minimum of the parabola is the y-coordinate of the vertex, so k= 7. Now substitute it into the formula;

Now substitute in the given point; ( -1, 9) and solve for a;

Hence the equation in vertex form is;

In standard form it is;

Answer:
ummmmm 0.825
Step-by-step explanation:
im pretty sure thats correct i havent done math like that in a while let me know if its right :)
B,C,A is the answer to your question
Okay this one is easy all you gotta do is look at the decimal point and the place its at.
-2x^3-x^2-6x-7
I don't really know what else