The side of a square sheet is increasing at the rate of 4 cm per minute. At what rate is the area increasing when the side is 8 cm long?

Match the items on the right to the items on the left.

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Given: the side of a square sheet is increasing at the rate of 4 cm per minute.

To find rate of area increasing when the side is 8 cm long, let the side of the given square sheet be x cm at any instant time.

So when the side is 8cm long, the rate of area increasing will become