8 15 17 i think no clue really
<h2>
Explanation:</h2><h2>
</h2>
The diagram is missing but I'll assume that the arc BDC is:

And another arc, let's call it FGH. measures:

If those arc are equal, then this equation is true:

Substituting k into the first equation:

Answer:
its 21 obviously
Step-by-step explanation:
this is because
<em>
</em>
Answer:
The line of symmetry is x = 3
Step-by-step explanation:
To find the line of symmetry in this case, use the base formula for vertex form.
y = a(x - h) + k
In this formula, h is the line of symmetry. In this case, h is 3.
I drew these, as I just did these in math not too long ago. When I shaded it, it was in all four quadrants.