The exponential growth and decay model describes the amount of a particular drug in a patient's bloodstream a certain time after the drug was given to the patient. The amount of this drug in the bloodsteam decreases at a rate of 35% per hour. If 2.5 units of this drug were given to the patient 10 hours ago, then how many units remain in his bloodstream now?

Arefrigerator uses r-134a as the working fluid and operates on the ideal vapor-compression refrigeration cycle except for the compression process. the refrigerant enters the evaporator at 120 kpa with a quality of 34 percent and leaves the compressor at 70°c. if the compressor consumes 450 w of power, determine (a) the mass flow rate of the refrigerant, (b) the condenser pressure, and (c) the cop of the refrigerator. (0.00644 kg/s, 800 kpa, 2.03)