The Spread of a Contaminant Is Increasing in a Circular

question 292

Multiple Choice

The spread of a contaminant is increasing in a circular pattern on the surface of a lake.The radius of the contaminant can be modeled by , where r is the radius in meters and t is the time in hours since contamination. ​
Find a function that gives the area A of the circular lake in terms of the time since the spread began.
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Definitions:

Self-sufficiency

The ability to fulfill all of one's needs independently, without reliance on external help.

More Money

A phrase representing the desire or need for increased financial resources or wealth.

Obedience

The act of following orders or commands from those in authority, often studied in psychology.

Authority Figure

An authority figure is a person with recognized power, influence, or expertise in a particular area, often used to guide or govern others.