Homework that was really hard for me. please show work

\f3. A convex octagon has interior angles with measures (x + 55), (3x + 20), 4x, (4x - 10), (6x - 55), (3x + 52), 3x, and (2x + 30). Find the value of x. 4. The sum of the measures of the interior angles of a regular polygon is 4320. Classify the polygon by the number of sides. 5. What is the measure of one interior angle of a regular 16-gon?6. If each interior angle of a regular polygon measures 160, how many sides does the polygon have? 7. Find the sum of the interior angles of a regular 43-gon. 8. What is the measure of one exterior angle of a regular 60-gon?9. If each exterior angle of a regular polygon measures 14.4", how mam sides does the polygon have? 10. Three of the vertices of .1360 are given. Find the coordinate of point D. Prove that the quadrilateral Is I parallelogram. D Ari2, 2).B(3.3),C(1.5).D= . \fFind the value of each variable so that the quadrilateral is a parallelogram. 13. A 2x + 4 11 3x - 13 y + 4 D A 14. 8y B 10y D (4x - 20)0 C15. Which statement would not prove that ABDC is a parallelogram? a. AB || CD and AB ~ CD A 6 b. ZA = LD and LB = ZC c. AB ~ BD and AC = CD C D d. AD and BC bisect each other. Drag the circle over your