Question

80 points if you answer this question!

Answer 1

Total amount of Carbon-14
$= 12 - (0.00012 \times 5000)$
$= 12 - 0.6$
$= 10.4$
=C

Full marks answer

Answer 2

Carbon 14 decays at a rate of -0.00012 grams per year

after 5000 years, 5000*0.00012 = 0.6 grams are lost from decay

An artifact was found to have an original amount of Carbon-14 of 12 grams.

after 5000 years, 12-0.6 = 11.4 grams of C-14 remains.