Question 240616
You are correct so far.  


18,000=13,500+22ln(t+1)
4,500=22ln(t+1)
204.5=ln(t+1)


The next step is to "undo" the ln function.  You can do this by raising both sides as a power of "e".


{{{e^204.5= e^(ln(t+1))}}}
{{{e^204.5= t+1}}}


Now, subtract 1 from each side:
{{{t=e^204.5-1}}}, which is approximately 6.5046*10^88 years, which is one HECK of a long time!!  Are you sure you copied this problem correctly??  Are all the units given in years???


Dr. Robert J. Rapalje, Retired
Seminole State College of Florida
Altamonte Springs Campus