An=a1+d(n-1)
d=3
a12=36
a12=a1+3(12-1)
36=a1+3(11)
36=a1+33
minus 33 both sides
3=a3
C is answer
Hi there!
Let's solve this problem step by step!
The sum of the angles measures 360°, which is given in the question.
We can also express the sum of the angles as a sum of variables. To do this we must add all the variables a.

Collect terms.

When we have this expression and the sum of the angles, we can set up and solve an equation.

Divide both sides by 6.

Therefore a = 60°
~ Hope this helps you!
Answer:
Nine
Step-by-step explanation:
Answer:
your answer will be option D)224
Step-by-step explanation:
have a nice day/night!!