dx (a) Find dt t = 1.5 dx dt dollars per month. It = 1.5 dx Find dt t= 4 dx dt dollars per month. It = 4 dW (b) Use the chain rule to find dt t = 1.5 dW dt million dollars per month. It = 1.5 (Round to the nearest tenth as needed.) dW Use the chain rule to find dt t= 4 dW dt million dollars per month. 1= 4 (Round to the nearest tenth as needed.)