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Please I really need help with this question. The amount of medicine in micrograms, A, in a person's bloodstream t minutes after a certain quantity

Please I really need help with this question.

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 approximately by the equation A=-15 (square)+75t. How long after inhalation will there be about 90 micrograms of medicine in the bloodstream?

There will be 90 micrograms of medicine in the bloodstream after ____________

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