Find the surface area of the pyramid. The side lengths of the base are equal.

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Which expression is not a polynomial?

If the ratio of sum of the first m and n terms of an ap is m2 : n2 , show that the ratio of its mth and nth terms is (2m − 1) : (2n − 1).