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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