The half-life of cesium -137 is 30 years.Suppose we have a 150-mg sample.Find the mass that remains after 
years.
Definitions:
Formal Operations
A stage in Jean Piaget's theory of cognitive development where individuals gain the ability to think abstractly, logically, and systematically, typically beginning in adolescence.
Ability
The possession of the means or skill to do something or perform a task effectively.
Private Speech
Vocal communication that individuals direct to themselves, often used as a tool for thought processing and problem-solving, particularly in children.
Lev Vygotsky
A Soviet psychologist known for his work on cognitive development, particularly the sociocultural theory that children learn through interactions with their surrounding culture.
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