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1. subtract the sum of 2x^2 +6-5 and x^2-3x+3 and x^2 - 2x +1

2. A 6 meter by 4 meter sandbox is placed on a square lawn x meter on a side. Express the remaining area as a polynomial.

3. An option box with a square bottom is to be made from a 45cm square piece of cardboard. Equal squares of side x are cut out of the corners and the sides folded up. Find the Polynomial for the volume and the outside surface area of the box.

4. The volume of a rectangle box is 12x^3+25x^2+x-2. The product of the length and width of the box is 4x^2+7x-2. Find the height of the box. ​