Need on these 3 math questions 1. multiply the radical expressions. (^3√n-3)(^3√n+5) 2.add or subtract the radical expressions as indicated. assume that all variables represent positive real numbers ^3√3y-√27y^5+√75y 3. evaluate the root without using a calculator or note that the root isn't a real number. ^4√16 a. 2 b. –2 c. 3 d. not a real number