Shane has a winning lottery ticket. he gives some money to his daughter, some money to charity and invests in the rest, in the ratio 3: 1: 11
he gives £7221 to his daughter. how much money does he invest?

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).