# 1
Multiple Choice
If a function f(x) has a relative minimum at x = 6, what does this tell us about the sign of its derivative f'(x) around x = 6?
- f'(x) changes from negative to positive at x = 6.
- f'(x) changes from positive to negative at x = 6.
- f'(x) is always positive at x = 6.
- f'(x) is always negative at x = 6.
