A study of the exercise habits of 17,000 alumni from a certain college found that the death rate (deaths per 10,000 person-years) was approximately  R(x) = 5x2 − 35x + 108,  where x is the weekly amount of exercise in thousands of calories  (0 ≤ x ≤ 4).  Find the exercise level that minimizes the death rate.  thousand calories

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