The total sales of S (in thousands of DVD's) of a certain movie are given by the following formula where t is the number of months since the release of the DVD. Use the formula to answer the questions. 90t2 S(t) = 2 + 100 a) Find S'(t). 18000t S' (t) = (12 + 100) 2 b) Find S(5) and S'(5). The value of S(5) rounded to the nearest hundredth is