I need help

What is (28 + 7 + 6 + 3) x 1/2 show your work

Choose the more precise measurement. 26.4 cm or 8.39 cm

*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