16 ds The area of a rectangular TV screen with a 16:9 ratio is given by A = 9 -S', where S is the height of the rectangular screen. If, as the TV is built, the height changes over time, which equation relates the rate of change of the height, -, to the rate of dA change of the area, ~ dt O dA 16s2 ds dt 9 dt O dA 32s ds dt 9 dt O dA 16 ds dt 9 dt O dA 16 9 - 52 dt O dA 32s dt 9