The last one 8,000 + 600 + 9
Answer: The sum of all of the interior angles can be found using the formula S = (n - 2)*180. It is also possible to calculate the measure of each angle if the polygon is regular by dividing the sum by the number of sides.
explanation: The formula for calculating the size of an interior angle is: interior angle of a polygon = sum of interior angles ÷ number of sides. The sum of exterior angles of a polygon is 360°. The formula for calculating the size of an exterior angle is: exterior angle of a polygon = 360 ÷ number of sides.
5.) -4b-15
6.) 13ac-4a+8b
7.) 4a-21b
8.) -14y
9.) -2x+21y