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Mathematics 13 Online
OpenStudy (anonymous):

If a person starts to learn y items in x hours as given by y=21(x^2)^1/3 find the rate of learning for a person at the end of three hours. I start out like this 1/3(21)(x^2)^-3/2 so 7(x^2)^-3/2 but now I am stuck and I don't know if what I did above was correct. Please help!

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