A drug has a concentration in the body given in ng/ml by the function 
, where t is the number of hours after it was administered. By how many ng/ml per hour is the amount of the drug in the body changing after 7 hours? Round to 2 decimal places.
Definitions:
Tall
Having a greater than average height.
Egocentrism
The psychological tendency to view the world from one's own perspective while having difficulty understanding other viewpoints.
Conservation
Conservation involves the protection, preservation, management, or restoration of natural environments, wildlife, and natural resources.
Preoperational
A stage in Piaget's theory of cognitive development, typically from ages 2 to 7, where children are unable to understand concrete logic and are instead focused on manipulation of symbols and language.
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