Afossil found by a paleontologist contains 21.875g of carbon-14. it originally contained 350g of carbon-14. how old is the fossil if the half life of carbon-14 is 5,730 years?

Iwould sure like to answer your question but i honestly just don’t know

  concave means having an outline or surface that curves inward like the interior of a circle or sphere. so the mirror curves inward.

If the heat engine is a perfect carnot cycle engine, thenefficiency = (t2-t1)/t2   where t1=temperature of cold reservoir ( ° k) = 135            t2=temperature of hot reservoir ( ° k)   = 325thereforeefficiency = (t2-t1)/t2 = (325-135)/325 = 0.5846 = 58%  note: this is the theoretical maximum efficiency of a perfect heat engine.   real-life engines do not achieve this value.