- Appearance of crystals?

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A barrel of 50kg is loaded into a lorry 1.6m high through a plank of length 3.4m. What is the minimum workdone.? Difference between cause and types in petroleum? Find the maximum value of f subject to the given constraint. f(x,y)=xy; x+y=196
The maximum value of xy;
subject to x+y=196 is? Value of density of plasma? If tigers don't hibernate and don't migrate what do they do?