Which ordered pairs shows an equivalent ratio pounds to dollars?

If tan2a=cot(a+60), find the value of a, where 2a is an acute angle

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?

What is 6/10 rounded to the nearest half