has a half-life of 
A sample has a mass of 
initially.Find the mass remaining after 42 days.
Definitions:
Perform
To carry out, execute, or conduct an activity or task.
Conform
The act of aligning one's attitudes, beliefs, or behaviors to match those of a group or social norms.
Adaptive Quality
Traits or behaviors that enhance an organism's ability to survive and reproduce in its environment.
Fight-or-flight Response
An automatic physiological reaction to an event that is perceived as stressful or frightening, preparing the body to either fight or flee from the threat.
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