∠ABC is a right angle decomposed into 2 non-overlapping angles, ∠ABD and ∠DBC. What kind of angle is ∠DBC?

How is working backward similar to solving an equation?

What is the slope of (0,32) and (100,212)

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).