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Algebra
Question

94. A forest fi e leaves behind an area of grass b...

94. A forest fi e leaves behind an area of grass burned in an expanding circular pattern. If the radius of the circle of burning grass is increasing with time according to the formula \( r ( t ) = 2 t + 1 \) , express the area burned as a function of time, \( t \) (minutes). 

Answer

\((4t^{2}+ 4t+ 1)\pi\)

Solution
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