Answer: c. This is geometry, not topology, and angles are invariant under translation.
Step-by-step explanation:
Each Interior Angle = 180° - (360 / sides)
144 = 180 - (360 / sides)
(360 / sides) = 36
sides = 360 / 36
sides = 10
It is a decagon.
Source:
http://www.1728.org/polygon.htm
Well standard form is Ax+By=C, so just move the -7x to the front so -7x+47=16