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An efficiency study conducted for an electronic firm showed that the number of cell phones assembled by the average worker T hours after starting work

An efficiency study conducted for an electronic firm showed that the number of cell phones assembled by the average worker T hours after starting work at 8 a.m. is given by:N(T) = -T³ + 6T² + 15TFind the rate at which workers will be assembling phones T hours after starting work. Are they working faster at 9 a.m. or at noon

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