Calc 1 Max/Min Derivatives?

Question

I need some help on this problem for Calc 1. I can't get the right numbers to come out.

I know how to find max / mins , and inc/dec , but this problem is harder than others and i need someone to show me how to do it.



a. Find the intervals on which f is increasing or decreasing
b. Find the l0cal maximum and minimum values of f.
c. Find the intervals of concavity and the inflection points

f(x) = (e^x) / (1 + e^x)

need to get crit numbers first and derivatives

Thx

Answer 1

Plot the graph - don't take derivatives
for large x =1
for x=0 =1/2
for large neg x =0
It is monotonically increasing. There are no critical points

Answer 2

for solution visit:

http://www.geocities.com/phengkimving