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in the lab, tom has two solutions that contain alcohol and is mixing them with each other. he uses 500 milliliters less of solution a than solution b. solution a is
14% alcohol and solution b is 20% alcohol. how many milliliters of solution b does he use, if the resulting mixture has 440 milliliters of pure alcohol?

Amass weighing 16 pounds stretches a spring 8/3 feet. the mass is initially released from rest from a point 2 feet below the equilibrium position, and the subsequent motion takes place in a medium that offers a damping force that is numerically equal to 1/2 the instantaneous velocity. find the equation of motion if the mass is driven by an external force equal to f(t)=cos(2t).