The value of a car C(t) depreciates according to C(t)=\frac{18}{t^{2}} The value of a stock S(t) depreciates according to S(t) =b/t for some value of b. Determine b so that

the car and stock have the same value when t =3/4 a. b=18 b. b=24 c. b=6 d. b=8