Kate makes a monthly donation. Her monthly donation is directly proportional to the square of her monthly savings. If she saves $900 and $1200 in January and February respectively, her donation increases by $35 from January to February. Find the amount she donates in January and February

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?