Answer:
hexagon, convex
Step-by-step explanation:
This shape has six straight lined sides (hexagon) and since it not round and larger that 180, it is considered convex
x=9/y
1)divide both sides by (2y)/3
2/3xy/2y/3=6/2y/3
x=9/4
n= 42
divide 420 by 10n and you get 42