The graph shows stopping distances for trucks at various speeds on dry roads and on wet roads. Use this information to solve Exercises 92–93.a. Use the statistical menu of your graphing utility and the quadratic regression program to obtain the quadratic function that models a truck’s stopping distance, f(x), in feet, on dry pavement traveling at x miles per hour. Round the x-coefficient and the constant term to one decimal place.b. Use the function from part (a) to determine speeds on dry pavement requiring stopping distances that exceed 455 feet. Round to the nearest mile per hour.

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Stopping Distance (feet) 700 600 500 400 300 200 100 Stopping Distances for Trucks at Selected Speeds Dry Pavement Wet Pavement 190 230 35 280 350 390 490 …...... 55 45 Speed (miles per hour) 525 665 65 ******