Question 813672
P(t)=240/(1+39e^0.3t)
It's hardly a "word problem" when you're given the equation.
240/(1+39e^0.3t) = 120
240/120 = (1+39e^0.3t)
1+39e^0.3t = 2
39e^0.3t = 1
e^0.3t = 1/39
ln(e^0.3t) = ln(1/39)
0.3t = ln(1/39)
t = ln(1/39)/0.3
t =~ -12.212
Doesn't seem right, does it?