<PRE><B>Question 138617</B>
by using this model P=11+44Inx, how many years will it take for the percent of spam to reach 85%?
:
Substitute 85 for P, find x
:
11 + 44*ln(x) = 85
:
Subtract 11 from both sides:
44*ln(x) = 85 - 11
44*ln(x) = 74
:
Divide both sides by 44:
ln(x) = {{{74/44}}}
ln(x) = 1.68182
:
Find the e^x enter: 1.68182
x = 5.3753 years
;
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Check solution in a calc; enter: 11 + 44*ln(5.3753) = 84.999 ~ 85
:
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