Question 635464
  <pre><font face = "Tohoma" size = 3 color = "indigo"><b> 
Hi,
 {{{Q(t) = 5e^(.0121t)}}}
Find the half-life of carbon-14. 
    {{{2 = e^(.0121t)}}}
   ln(2)/.0121 = t = 57.2849 yrs
the 'ln' function is on scientific calculators
 ln(2) being a symbol for *[tex \large\ \ log_e2]
Using a caculator, this is the quickest way to do decay problems
 enter 2, hit ln and then / .0121