The 23 <em>exterior</em> angles add to 360. The interior angles are supplements of the exterior angles.
180 - 360/23 = 3780 / 23 = 164.3478...
Answer: a
4 ft equals 48 inches, because every ft is 12 in
You would expect

to be increasing to the left of

, and decreasing to the right, which corresponds to

being positive when

(but near

) and negative when

.
The answer would be n=5f/6 + 46