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- Wayne DeguManLv 74 months agoFavourite answer
M = x³ + 0.1x⁴

so, dM/dt = 3x².dx/dt + 0.4x³.dx/dt

Then, with x = 6 and dx/dt = 0.05 we get:

dM/dt = 3(6)²(0.05) + 0.4(6)³(0.05)

i.e. dM/dt = 108(0.05) + 86.4(0.05)

=> dM/dt = 9.72 grams/hour

:)>

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