Help me answer these International Economics problems

myeconlab MS 1. Home's demand curve for wheat is D = 100 - 20P. Its supply curve is S = 20 + 20P. Derive and graph Home's import demand schedule. What would the price of wheat be in the absence of trade? 2. Now add Foreign, which has a demand curve D* = 80 - 20P, and a supply curve S* = 40 + 20P. a Derive and graph Foreign's export supply curve and find the price of wheat that would prevail in Foreign in the absence of trade. b. Now allow Foreign and Home to trade with each other, at zero transportation cost. Find and graph the equilibrium under free trade. What is the world price? What is the volume of trade