Type the correct answer in each box. Use numerals instead of words. Given that quadrilateral ABCD is a rhombus, determine the missing coordinates for point D.
A(1,1), B(3,5), C(7,7), and D( , ).

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).