Solve the following quadratic equation for x p2q2 + (p2-q2)x -q2 =0

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%.

He concluded that a heavier object dropped from the same height as a lighter object will land

Can someone me with these two circle theorem questions asap?