Triangle a b c is reflected across the line of reflection m to form triangle a prime b prime c prime. triangle a prime b prime c prime is rotated about point b prime 270 degrees to form triangle a double-prime b double-prime c double-prime. which rule describes the composition of transformations that maps δabc to δa"b'c"?

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).