Question

1)The area of a blot of ink is growing such that after t seconds it's area is given by A= 3t^2+7 cm^2. Calculate the rate if increase of area at t= 5sec.

2. A metallic disc is being heated. It's area at any time t is given by A=5t^2+4t+8. Calculate rate of increase in area at t=3s

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Answer 1

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