The amount of medicine in micrograms, A, in a person's bloodstream t minutes after a certain quantity of it has been inhaled can be approximated by the equation Upper A equals negative 40 t squared plus 160 t. How long after inhalation will there be about 120 micrograms of medicine in the bloodstream?
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The amount of medicine in micrograms, A, in a person's bloodstream t minutes after a certain quantit...
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