Multiple choice 4. if each interior angle of a regular convex polygon is nine times the measure of the exterior angle, how many sides does it have? 18 sides 10 sides 40 sides 20 sides

Answer asap ! the shortest path from point a to point b goes through a pond. to avoid the pond, you must walk straight 34 meters along one edge of the pond, then take a 90 degree turn, and again walk straight 41 meters along another edge of the pond to reach point b. about how many meters would be saved if it were possible to walk through the pond? a. 11 m b. 20 m c. 30.45 m d. 21.73 m

Ineed in figuring out this problem.

Which value of m will create a system of parallel lines with no solution? y = mx - 6 8x - 4y = 12