Answer: I believe this is the answer.

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7 and -6
or
-7 and 6
It’s 8 u cross multiply 7 and 1 then 1 and 56 and then divide 56 by 7
where's the rest of question so I can help?
Answer:
1120°
Step-by-step explanation:
Use the sum of interior angles formula:

Where n is the number of sides.
In a nonagon, there are 9 sides, substitute 9 for n:

Since our nonagon is a regular nonagon, all 9 angles measure the same, so each angle measures:

Subtract 140 from 1260:
