Answer:
concave pentagon I'm thinking
Answer: D
Step-by-step explanation:
Just do 7 x 88 LOL
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:

Answer:
D
Step-by-step explanation:
40x - 8y + 24 = 0
-8y = -40x - 24
y = 5x + 3