Question 1003537
The retention rate of the drug is  100-5.02=94.8% per hour.
{{{highlight(D=500*(0.948)^t)}}}.


The question asks for D when t=6.


{{{D=500(0.948)^6}}}
{{{D=500*0.725855252786417664}}}
You can only take three significant figures:
{{{highlight(363*milligrams)}}}