Solve the next two problem. (See Example 5.)
Social Science The number of drivers who die in automobile accidents is related to the ages of the drivers, with teenagers and the elderly having the worst records. According to data from the National Highway Traffic Safety Administration, the driver fatality rate D per 1000 licensed drivers every 100 million miles can be approximated by the equation D = .0031x2 − .291x + 7.1, where x is the age of the driver.
(a) For what ages is the driver fatality rate about 1 death per 1000?
(b) For what ages is the rate three times greater than in part (a)?
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