When there are x milligrams of a certain...

When there are x milligrams of a certain drug in a patient's bloodstream, a patient's heart rate, h, in beats per minute, can be modeled by the equation `h=60+0.5x`. Which statements are true?
I. 10 minutes after taking the drug, the patient's heart rate increase to 75 beats per minute.
II. When the drug is not in the bloodstream, the patient's heart rate is 70 beats per minute.
III. For each 10 milligram increase of the drug in the patient's bloodstream, the patient's heartbeat increase 5 beats per minute.

I and II

I and III

II and III

I, II, and III

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