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In a certain memory experiment, a person is able to memorize M words after t minutes,...

In a certain memory experiment, a person is able to memorize M words after t minutes, where
?(?) = −0.001?^3+ 0.1?^2
a) How many words are memorized after 10 minutes (at ? = 10)?
b) Find the rate of change of the number of words memorized with respect to t.
c) At what rate are words being memorized after 10 minutes (at ? = 10)?
d) At what rate are words being memorized after 20 minutes (at ? = 20)?
Math   Calculus   
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