1.8 Higher-Order Derivatives 5 comet {} Part 1 of9 0 Points: 0 of 1 A company determines that monthly sales S(t), in thousands of dollars, aftert months of marketing a product is given by S(t) = 2t3 45t2 + 240t + 120. a) Find S'(1), S'(2), and S'(4). b) Find S\"(1), S"(2), and S\"(4). c) Interpret the meaning of your answers to parts (a) and (b). E> (a) First, nd so)