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.
A)
B)
C)
D)
E)
Correct Answer:
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