The daily marginal revenue function associated with selling x widgets is given by R'(x) = 9x2 + 8x + 45 where R'(x) is measured in dollars per unit per day and x denotes the number of widgets produced and sold. (a) Determine the revenue function, ROG, associated with producing and selling x widgets. (b) Determine the demand function relating unit price, p(x), to the quantity demanded, x