The product of a number is its multiplication answer. so the product of 3x3 would be 9.
Imagine the side of the building is one side to a triangle and the second would be from the top of the building to the point where the shadow ends and the third is from the base of the building to the point where the shadow ends. Just use the pythagoreon theorem to find stuff. I can't solve the problem you gave because you would need the height of the building
15.99x + 12.50y < = 125......this would be ur inequality
