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26.6=18.5e0.1722t

 Apr 16, 2016
 #1
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+5

Take the ln of both sides

ln26.6 = .1722t+  ln18.5

 

(ln26.6 -ln18.5 ) / .1722  = t   = 2.1088

 Apr 16, 2016
 #2
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Solve for t over the real numbers:
26.6 = 18.5 e^(0.1722 t)

 

26.6 = 133/5 and 18.5 e^(0.1722 t) = 37/2 e^(861 t/5000):
133/5 = 37/2 e^((861 t)/5000)

 

133/5 = 37/2 e^((861 t)/5000) is equivalent to 37/2 e^((861 t)/5000) = 133/5:
37/2 e^((861 t)/5000) = 133/5

 

Multiply both sides by 2/37:
e^((861 t)/5000) = 266/185

 

Take the natural logarithm of both sides:
(861 t)/5000 = log(266/185)

 

Multiply both sides by 5000/861:
Answer: |  t = 5000/861 log(266/185)=2.108829......etc.

 Apr 16, 2016

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