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Limits & Continuitymedium
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A rectangle has width w(t)=tw(t) = tw(t)=t and length l(t)=2tl(t) = 2tl(t)=2t. What is the limit of the perimeter P(t)=2(w+l)P(t) = 2(w+l)P(t)=2(w+l) as t→5t \to 5t→5?