Which of the following commands in Mathematica can be used to find a decimal approximation of √/5? NOTE: you may select more than one answer! N[Sqrt[5]] Sqrt[5]//N Approximate [Radical[5]] N[Sqrt[x]]. x 5 Sqrt[5.] RoundOff[Sqrt[5]] NSolve[Sqrt[5]] - - Define the function f(x) = xª — 5x³ – 6x² + 23 on Mathematica. Then evaluate and expand the expression f(3w – 1). The result should be a polynomial in the variable w. Let c be the coefficient of the term involving w³. Enter the value of c below. c = -81