Please only answer if you know it's correct

Find the sum of the measure of the interior angles of a polygon of 9 sides ; of 32 sides

Aline parallel to a triangle's side splits ab into lengths of x - 5 and x + 2. the other side, ac, is split into lengths of x and x + 12. what is the length of ac? a) 12 b) 24 c) 36 d)

Factor the expression using the gcf. the expression 21m−49n factored using the gcf