Find a pattern that suggests a way to fill in the table for regular polygons with 7,8,9 and 10 sides

What expression is equivalent to 1/2(2+3x-6)

An empty bucket is placed under a faucet dripping at a constant rate of 4 milliliters per minute. with the given information, which of these statements is a reasonable conclusion? a there will be 24 milliliters of water in the bucket after 16 hour. b there will be 60 milliliters of water in the bucket after 14 hour. c there will be 160 milliliters of water in the bucket after 20 minutes. d there will be 100 milliliters of water in the bucket after 40 minutes.

Any is very appreciated! (picture is provided below)not sure how to do this at all won't lie