Find the surface area 2M , 7M , 8M

Write a function that matches the description. a cosine function has a maximum of 5 and a minimum value of -5. f (r) =

Anyone know these questions? i need ,.

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?