Find the rate of change of the distance D between the origin and a moving point on the graph of y = x2 + 4 if dx dt = 2 centimeters per second. dD dt = 4 x3+10 xx4+4 x2+16 dD dt = 4 x3−18 xx3+9 x2+16 dD dt = 4 x3+18 xx4+9 x2+16 dD dt = 2 x3+18 xx4+8 x2+16 dD dt = 2 x3−10 xx3+9 x2+16