What is the values of these exponential expressions: (2^3)(4^3)(2 * 4)^-3     4^2 * 3^5 * 3^-2 (4 * 3) ^-3     (5*4^2)^2 * 4^-5 * 5^-2 * 4^2     (4^2)(6 * 4^3)^2 (6 * 4^2)^-2