Ineed finding this sigma-notation sum. i'm not quite sure what to do with the exponent, i have determined a1 = 12, a2=36, a3=108, and a4=324. i notice the pattern of multiplying by 3 each segment, but i'm struggling how to equate this to a form that is simple enough to call an answer.

Pls brainliest will be awarded if answer is correct

*let m∠cob = 50°30’, m∠aob = 70° and m∠aoc = 20°30’. could point c be in the interior of ∠aob? why? a. point c could be the interior of aob but it is not the only case b. point c is the interior of aob c. point c is not the interior of aob d. the given is not possible for the plane geometry answer

What would be the reasons for lines 3 and 4? a. addition property; subtraction property b. addition property; solve c. substitution property; subtraction property d. substitution property; prove