
.................................
Answer:
9
Step-by-step explanation:
Fun fact. The name nonagon comes from Greek enneagonon, and is arguably more correct, though less common than "nonagon".
The vertex is (-3,3),so a =-3, b=3. a+b=0
Question # 17 Solution
Answer:

Step-by-step Explanation:
The given expression

And we have to solve for x₁
So,
Lets solve for x₁.

Multiply both sides by x₂ - x₁




Divide both sides by -m


Therefore, 
Question # 23 Solution
Answer:

Step-by-step Explanation:
The given expression

And we have to solve for n
So,
Let's solve for n.

Multiply both sides by b.

Factor out n.

Divide both sides by -b + x.


Therefore, 
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Answer:
C since y-x are being subtracted and there should be another subtraction but there isnt