Posted by **Angie** on Saturday, April 4, 2009 at 10:10pm.

how old is a mammoth's tusk if there is only 25 percent C-14 remaining in the sample?

a.5700 years

b.11400 years

c.17100 years

d.22800 years

- science -
**bobpursley**, Saturday, April 4, 2009 at 10:26pm
Half disappeared in one half-life.

Half that remaining disappeared in the next half-life.

- science -
**Angie**, Saturday, April 4, 2009 at 10:44pm
..what does that mean?

- science -
**PsyDAG**, Sunday, April 5, 2009 at 12:40pm
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.

- science -
**steve vincent**, Monday, February 6, 2012 at 5:09pm
b.11400 years

- Chemistry -
**Oscar**, Monday, February 4, 2013 at 8:34pm
B. 11400 years

- science -
**Sally**, Tuesday, January 14, 2014 at 10:26pm
5700

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