The constants in each expression represent an amount of money that is donated directly to a specific turtle each month. What amount for each ticket is donated directly to a turtle? what does this problem mean

Will mark the brainliest.paula makes stained-glass windows and sells them to boutique stores. if her costs total $12,000 per year plus $4 per window for the frame. how many windows must she produce to earn a profit of at least $48,000 in one year if she sells the windows for $28 each?