a) 5, 10, -10, -6 (5 and 10 earned from work, 10 and 6 spent on expenses)
b) I'm sorry I can't plot on the computer
c) 3/2, 2/3, 0.5, 5/4; week one and four has the greatest amount eaten because 3/2 and 5/4 are the two largest numbers.
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