Suppose that in a memory experiment the rate of memorizing is given by M'(t) = -0.006² +0.4t, where M'(t) is the memory rate, in words per minute. How many words are memorized in the first 30 minutes (from t=0 to t = 30)? A. 216 words B. 126 words C. 306 words D. 36 words

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