posted by Angie .
how old is a mammoth's tusk if there is only 25 percent C-14 remaining in the sample?
Half disappeared in one half-life.
Half that remaining disappeared in the next half-life.
..what does that mean?
Knowing the half-life of C-14 would allow you to take twice the half-life.
From searching the Internet under "C-14 half life", I found that the half-life of Carbon 14 is 5730 years.
This should help a little more. Thanks for asking.
B. 11400 years