Sharona's age is at most 3 more than twice Kayla's age. If Sharona is 35 years old, which inequality best represents the situation, where a represents Kayla's age?

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).