13. -1 Guess/No work 0 Some work 1 Partially correct 2 Substantially correct 3 Correct No answer
14. -1 Guess/No work 0 Some work 1 Partially correct 2 Substantially correct 3 Correct No answer
15. -1 0 1 2 3 No answer
16. -1 0 1 2 3 No answer