(4) Just after taking an aspirin, a patient has 300 mg of the drug in their bloodstream. After six hours, only 75 mg remain. (a) Find an exponential model, of the form y= A(b') for the amount of aspirin in the bloodstream after t hours. (b) Based on your model in part (a), how much aspirin will there be in the bloodstream after 5 hours. (c) Based on your model in part (a), find to the nearest 0.1 hour, the time it will take for the amount of aspirin in the bloodstream to decrease to 10 mg.

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