Using the sum of interior angles formula;
(n-2)×180=sum
(n-2)×180=2880
n-2=2880/180
n-2=16
n=16+2
n=18
Therefore, this polygon would have 18 sides.
Hope I helped :)
i really cant see what it says sorry
Answer:

Step-by-step explanation:

we substitute the value of "y" in the equation:
Answer:
It’s 123456
Step-by-step explanation:
23456
6789
980
Answer: (c) y<=-x+4
The area is shaded UNDER the boundary line, hence "<"
The boundary is plotted as solid line, hence "="