Answer:
There is no error
Step-by-step explanation:
While it is not necessary to guess an answer, because the answer can be calculated using the properties of equality, guessing is a legitimate solution method actually taught in (some) schools these days.*
The equation is properly written, data properly filled in, and the solution properly verified. There is no error.
_____
* What doesn't seem to be taught in US schools are methods of refining an incorrect guess. These are actually well-developed, and are legitimate ways to get to a good answer.
20 because for all regular polygons their exterior angles add up to 360, so 360\18 =20
Answer:
DELETE i will answer later doe:)
Step-by-step explanation:
It would be 50
130+180= 310
360-310= 50
You get 180 from the missing side by 70 that becomes 180.
