1. A grain silo consists of a right circular cylinder capped by a hemisphere. Express its volume as a function of its height and radius. 2. Provided that x # : or - : Simplify the following expression: Ox-x 2 4x 2 - 1 3. Find two consecutive, negative, even integers whose product is 168. 4. If the length and width of a 4-by-2 rectangle are each increased by the same amount, the area of the new rectangle will be twice that of the original. What are the dimensions of the new rectangle