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Mathematics 21 Online
OpenStudy (anonymous):

PLEASE HELP!

OpenStudy (anonymous):

OpenStudy (anonymous):

JUST THE BOTTOM ONE....

jimthompson5910 (jim_thompson5910):

The answer is choice C since this is the only one where the growth rate of g(x) is larger than the growth rate of f(x)

OpenStudy (anonymous):

ok, can you explain to me how that helps? sorry, I don't understand what that has to do with the limit

jimthompson5910 (jim_thompson5910):

use l'hospital's rule and derive the numerator ln(x) to get 1/x and derive the denominator e^x to get e^x So we now have the fraction \[\frac{(1/x)}{e^x}\] which becomes \[\frac{1}{xe^x}\] Hopefully you can see that the limit as x goes to infinity is 0.

OpenStudy (anonymous):

what about e?

jimthompson5910 (jim_thompson5910):

The term xe^x approaches infinity as x approaches infinity, so \[\frac{1}{xe^x}\] approaches 0 as x approaches infinity

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