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#### karush

##### Well-known member

- Jan 31, 2012

- 2,994

Which of the points labeled by a letter have

(a) $f'$ and $f''$ non-zero and the same sign

*B, E*(b) At least two of $f, f', f''$ equal to zero

**A, C, D**not sure if these selections were correct and was ??? about D in the slope appears to be zero

f' is about slope f'' is about inflection pts and increasing and decreasing I presume

thanks ahead.