During a clinical trial, an experimental medication is administered to several patients, and the concentration of the drug in the patients' bloodstreams are measured.

It is found that the bloodstream concentration, CC (in g/mL), can be modeled by C(x)=C(x)=13xx2+2513xx2+25 where xx is the number of hours after the dose is taken.

Additionally, 66 hours after treatment, no trace of the drug could be found in the patients' systems.

A) What is the expected concentration of the medication in a patient's bloodstream 77 hours after administration? (Round your answer to at least 3 decimal places.) g/mL

B) What is the domain of the function C(x)C(x)?

C) What is a realistic domain of C(x)C(x) in the context of this problem?