Question: question: a cube with 10inch side is covered with a coat of fibre glass 0.2 thick. Use differentials to estimate the volume of the fibreglass

question: a cube with 10inch side is covered with a coat of fibre glass 0.2 thick. Use differentials to estimate the volume of the fibreglass shell.

the answer is 120inch3

My question is to help me understand how to use differentials in this situation where there is no formula (f(x)= ....)

Thank you in advance for your time.

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