Please help can you answer this please

Rose bought a new hat when she was on vacation. the following formula describes the percent sales tax rose paid b=t-c/c

Sophia wrote an equation to represent the revenue of a movie theater for one day. she let x represent the number of child tickets sold and y represents the nunver of adult tickets sold. if a child ticket cost $4, an adult ticket cost $6, and the total revenue for the daybwas $420, which equation could sophia use to represent the number of chikd and adult tickets that were sold?

Find the interior angle of a regular polygon which has 6 sides