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The number of mosquitoes m(x) in millions, in a certain area depends on the June rainfall x, in inches. m(x)-20x-x^2. What rainfall produces the max number of mosquitoes?
Frank can type a report in 2 hours and James takes 5 hours. How long does it take them together?
A man rode a bike for 12 miles and hiked 8. The total time for the trip was 5 hours. If his rate when he was riding a bike was 10mph faster than his rate walking, what was each rate?
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