Question 1059769

To the nearest year find the half-life of plutonium -239 given that it decays according to the formula A= A0^e-0.0000284t 
<pre>t, or time = {{{highlight_green(matrix(1,7, (ln (1/2))/-.0000284, "=", 24406.59086, or, about, "24,407", years))}}}