7th grade math help me pleasee :))

Which angle has the same measure as the dehedral angle formed by the orange face and the purple rectangle

The ratio of the height of two similar cylinders is 4 to 3 what is the ratio of their volumes

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).