Answer:

Step-by-step explanation:
Given


Required
Find a and b
Substitute
for x and y in 



Rewrite as:

The above implies that (a) is correct;
Hence:

So, the equation is:

Each exterior angle is 11.25°
40.50-21.75=23.75
23.75/3=7.916 which you would round up to 7.92 so the answer is “about $7.92”