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 20 25 30 35 40 45 Accident rate R 1600 800 300 250 700 1400 (a) Use regression to find a quadratic model for the data. (Round the regression parameters to two decimal places) R= X (b) Calculate R(60) (Round your answer to two decimal places) A(60)- Need Help? Explain what your answer means in practical terms. Commercial vehicles driving at night on urban streets at miles per hour have traffic accidents at a rate of (c) At what. speed is vehicular involvement in traffic accidents (for commercial vehicles driving at night on urban streets) at a minimum? (Round your answer to the nearest whole number) xmph per 100,000.000 vehicle miles

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