Answer:
1.11,1.23,2.13, 3.12
Step-by-step explanation:
Answer:
c
Step-by-step explanation:
Answer:
Sum of two interior angles=exterior angle




Done!
Let "x" be a substitute for "a number"
1/3(x)=x-12 Multiply by 3
x=3x-36 Get n onto the same side of the equation
2x=36 Divide by 2
x=18
That's your answer.