Question 1077704
Half the mass lost is:
1/2=e^-kt where k is a constant, and t is the time. In this case,our substances' half life is 1200, so:
-0.69314718055994530941723212145818=-1200k
k=0.000577622650466621
e^-(0.0005776226504666211)1800=35.355339059327375658806198307235% of the mass remaining after 1800 years. &#9786;&#9786;&#9786;&#9786;