Answer:
+
Step-by-step explanation:
The three consecutive integers can be represented by x, x+1, and x+2
x+(x+1)+(x+2)= 42
3x+3=42
3x=39
x=13
Final answer: 13, 14, 15
The equation for this is (n-2) x 180
Replace n with the number of sides:
a. 9: (9-2) x 180 = 7 x 180 = 1,260
b. 19: (19-2) x 180 = 17 x 180 = 3,060