Question 20 A farmer needs a new pen for some of his _A. 400 feet 2 livestock and decides to build a rectangular B. 300 feet 2 fence. The farmer has 80 feet of fence. What is the greatest area the farmer could C. 200 feet - enclose? D. 225 feet - A DQuestion 19 Suppose you are given that f(-2) = -10. f A. increasing (2) = 5, f'(-2) = 3, and f'(2) = -2. Is f(x) B. decreasing increasing, decreasing, or neither at the point x = -2? C. neither OB CA\fQuestion 13 A. Consider this graph of P' (t). At which t-value is P(t) the smalist? B. t3 C. D. ta E. Don't know