The exponential function describing the quantity of caffeine remaining in a person's body, Q , t hours after that person drinks a Venti cup of coffee from Starbucks is Q(t) = 415 · (0.8)* Q(t) is graphed below. Add the line Q = 50 and then use the graph to estimate how long it takes until only 50 mg of caffeine are left in the person's body. 500- 450 400 350 300 250 200 150 100- 50 6 7 8 9 10 Clear All Draw: How long does it take (in hours) until only 50 mg of caffeine are left in the person's body?

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