72/96 * 100= 75% so the answer is 75%
Sum of Interior Angles = (Number of Sides -2) • 180 degrees
Sum of Interior Angles = 29 * 180
Sum of Interior Angles = 5,220
The product of a number and 3 can be represented as 3n (where n = unknown number). Then 6 less than 3n is 3n - 6.
3n - 6 = -18
3n = -12
n = -4
Check:
-4 x 3 = -12
-12 - 6 = -18 (this works!)