Which set of ordered pairs (x, y) could represent a linear function? A = {(-9,4), (-4,1), (2,-2), (7,-5)}
B = {(-1,9), (5,7), (7,6), (9,5)}
C = {(-3, -3), (0, -1), (2, 1), (4,3)}
D = {(-5,5), (-1,4), (3,3), (7,2)}

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Jody bought 20 shares of amazon at the close price of $121.00. she bought 20 more shares a year later at the price of $127.00. two years later, she sold all of her shares at the price of $133.00. her broker charges $50 for each transaction. after all of these transactions, how much money did jody make?