The answer is 13.23
-4.2(0.35-3.5)
-4.2(-3.15)
13.23
<span>* carbon-14 levels in a sample are undetectable after approximately nine half-lives.
Nine half-lives pf carbon 14 is 51,570 years.
Source:
https://en.wikipedia.org/wiki/Radiocarbon_dating
</span>
The answer is 3/10 cause 3 bars out of 10 are shaded in.
hope it helped!!!
