The following table shows the rate R of vehicular involvement in traffic accidents (per 100,000,000 vehicle-miles) as a function of vehicular speed s, in miles per hour, for commercial vehicles driving at night on urban streets. Speed s Accident rate R 20 1650 25 600 30 35 350 350 40 750 45 1300 (a) Use regression to find a quadratic model for the data. (Round the regression parameters to two decimal places.) R = (b) Calculate R(70). (Round your answer to two decimal places.) R(70) -

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