Answer:

Step-by-step explanation:
Standard form:

Vertex form:

(h, k) is the vertex
x is the coordinate of the vertex
To find x use the formula:


a=1
b=-2
c=-6
Substitute:

Substitute x in equation:

h=1
k=-7
Substitute h, and k into the vertex formula:

3.14159265359
So the 7th number would be 2.
I think its 44. The amount of people increase by 12 every time you add more subs. Hope that helps!
Answer: -105x^5 + 67x^4 + 240x^3 -100x^2
Take out the factor of 3 from both numbers
(69)/3 = 23
(12)/3 = 4
69 + 12 can be rewritten as 3(23 + 4)
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