The demand function for a certain brand of compact discs is given by P- -5x2 - 3x + 28 where p is the wholesale unit price in dollars and a is the quantity demanded each week, measured in units of a thousand. Compute the elasticity of demand when z = 2. O O O O 23The weekly demand function is given by p+x + 4xp = 68. where a is the number of thousands of units demanded weekly and p is in dollars. If the price p is decreasing at a rate of 91 cents per week when the level of demand is 5000 units, which one of the following statements is true? Demand is increasing at 1470 units per week Demand is increasing at 1400 units per week Demand is decreasing at 1400 units per week Demand is decreasing at 1470 units per week Demand is decreasing at 1330 units per week