49. {(−1, 2)}
51. {(2,−1, 3)}
53. {(−5, 1, 5)}
55. Treasury: $16,000; bonds: $48,000; fund: $26,000
57. V=10, E=15, R=7
59. X=[100100]
61. X=⎡⎣⎢⎢⎢⎢⎢⎢⎢216,000277310,000277304,000277⎤⎦⎥⎥⎥⎥⎥⎥⎥
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