In a laboratory accident a work area is contaminated with radioactive material. Health physicists monitor the area during a 30-day period and, after correcting for the background rate, obtain the data shown in the table. 
The accident occurred at t = 0. They determine that it will not be safe for workers to enter the area until the radioactivity level has dropped to 133 counts per minute. Of the choices listed below, which one is the earliest time that workers could safely return?
Definitions:
Art History
The academic study of objects of art in their historical development and stylistic contexts, including genre, design, format, and style.
Final Exam
A comprehensive test administered at the end of a course of study to evaluate a student's knowledge and learning in the subject matter.
Hippocampus
A region of the brain that is associated with memory formation, organization, and storage.
Brain Injury
Damage to the brain caused by an external physical force, potentially leading to temporary or permanent impairment of cognitive, physical, and psychosocial functions.
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