precalc
posted by Jus .
The probability, P, in percent, that a person will respond to a certain ad can be modelled by the equation P(n)=12^(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:
0.20=12^(0.05n)
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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