2. Simplify the following expressions (a) (2 points) 1/x2 - 1/y2 1/x2 + 1/y2 (b) (2 points) 1 1 1 - pp-9 (c) (2 points) T'-1-6 12-9 12-4 x-+21-33. (4 points) The expected yearly interest rate for a deposit account is r from year 1 to year 5, and is r2 from year 6 to year 10. The total amount of cash that can be withdrawn at the end of year 10 is targeted to a dollars. To achieve this target, what is the amount of dollars that should deposited in year 0?5. (2 points) In the following system of two linear equations, solve for a and y, given z. 7cty+z =5 6x + 2y - z = 3 6. (4 points) Suppose in a market, the demand function is Qp = 5-bP2 and the supply function is Qs = -1+6P. Solve for the equilibrium