The concentration of a certain medication y in the bloodstream at time x hours is approxim...

The concentration of a certain medication y in the bloodstream at time x hours is approximated by

where y is measured in milligrams per liter. After two days the medication has no effect.

(a) Find a viewing window that contains only those points on the graph of the equation that are relevant to the situation.

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(b) At what time is the concentration of the medicine the highest and what is the concentration at that time? Round your answers to three decimal places.