Easy question give a formula used for finding the area of a square. then use the formula to find the area of a square with a side length of 6.3 cm

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?