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OpenStudy (anonymous):
Find f '(a). f(t) = (9t + 7)/(t + 2)
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OpenStudy (turingtest):
f'(t)=[9(t+2)-1(9t+7)]/[(t+2)^2]=-5/[(t+2)^2] f'(a)=-5/(a^2+4a+4)
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