Answer:
A)
Goods          A   B   C   D   E   F
Candy Bars      0   4   8   12  16  20
Bags of Peanuts  10   8   6   4   2   0
B) graph
the slope of the line = 1.5 / -0.75 = -2
the opportunity cost of one more candy bar is 1 bag of peanuts (actually half a bag of peanuts, but you cannot purchase half of something).
the opportunity cost of one more bag of peanuts s 2 candy bars.
C) it doesn't tell me which combination to buy, it only tells me the possible combinations.
D) if I had won $30, the slope would have been the same, the total number of items purchased would have changed, increasing the available combinations.