A chemist has one solution that is 5% acid and a second that is 2% acid. How many gallons of each should be mixed together to get 16 gallons of a solution that is 3.25% acid? Define the variables Write a system of equations to determine how much should be used to form 16 gal of a 3.25% acid solution? Equation 1 Equation 2

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).