Find the value of c to complete the square. z^2 − 10z + c x^2 − 34x + c

r^2+ 32r + c r^2 − 6r + c r^2 + 20r + 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?