Answer Please ⠀⠀⠀⠀⠀⠀⠀⠀

What is the missing constant term in the perfect square that starts with x^2 -20x

Adepartment store purchases screen-printed t-shirts at a cost of $5 per shirt. they mark up the price 150% (making the selling price 250% of the store's purchase price) and put them on the sales floor. every month that a t-shirt doesn't sell, the store reduces the selling price by 25%.

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?