$\lt x \lt$
$\lt y \lt$
Half-life = (If you round your answer, include at least 4 significant digits.)
The solutions are $y = $
If there are more than one solution, separate answers by commas
$y = $
The numbers are
Separate answers by a comma.
$f(f(f(8))) =$
$A=$ , $k=$
^
a^b
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$y(u(x)) = $