The midpoint of the line segment is (11, −5). If one endpoint of the line segment is (−4, −8), find the coordinates of other endpoint.

(26, 3)

(3.5, −6.5)

(15, 3)

(26, −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).