February 25, 2017

Homework Help: pre-calc

Posted by Jus on Tuesday, May 19, 2009 at 3:43pm.

The probability, P, in percent, that a person will respond to a certain ad can be modelled by the equation P(n)=1-2^(-0.05n), where n is the number of days since the ad began on tv. After how many days is the probability greater than 20%?

my work:

then i solved for n, but i got a negative number.. what is wrong with my equation that i made and why

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