For the following exercises, determine whether the functions are even, odd, or neither. Show working.
15. f(x) = -x^5 + 9x^6
16. f(x) = -x^5 + 9x^5^23
17. f(x) = -1/x
18. Graph the absolute value function f(x) = -2|x - 1| + 3.
20. Solve -|x - 3| ≥ 17. Express the solution in interval notation.
19. Solve |2x - 3| = 17.