Hey, I'll give it a go.
(1) So for the first part, it would be 12 as free trade is about removing the barriers to trade, namely protectionist policies, so in this case it would be a subsidy.
(2) The world price would be 8 for similar reasoning. The price without any subisidies or tariffs.
(3) Quantity supplied would be 200 units, just follow the price and match up with the Supply curve.
(4) Quantity supplied is 150 for same reasoning
(5) Quantity demanded with free trade is 150 as that's where the price meets the demand curve
(6) The quantity of exports is the same as above so 150 units as the curves are at equilibrium so the supply meets the demand.
(7) This gets tricky, so you have to find the amount of units of product is sold to do this you look at the quantity supplied at the price 12 (200 units) and the quantity demanded at the same price (100 units) and then subtract it, then you times that quantity by the price sold, so 12:
200-100=100 units
100 x 12 = $1200 (Supplier revenue without free trade)
(
Similar to above but this time since the supply meets the demand curve at the world price (with free trade) of 8, it is just a straight multiplication:
8 x 150 = $1200
(9) Lastly, not 100% on this question but I would say that it is a export-competing market because the supplier revenue without free trade (e.g. Australia) is the same as the supplier revenue with free trade (e.g. Japan). Thus, because each supplier is gaining the same amount of revenue, neither of them is out competing the other, so it is an export-competing market.
Hope this helps!!!