The concentration of a drug in a patient's bloodstream t minutes after an oral dose was administered was approximately C(t) = 0.7t(0.98t ), where C(t) was measured in micrograms per milliliter (µg/mL). Find the rate at which the drug concentration was decreasing two hours after the dose was taken. (Round your answer to four decimal places.)

Which of the following questions describes the equation g + (-4) = -5? a)what number, when added to negative four, is equal to negative five? b)what number, when added to negative five, is equal to negative four? c)what number, when subtracted from negative four, is equal to negative five? d)what number, when subtracted from negative five, is equal to negative four?