# Applying the Concepts

49. $\{(-1,\text{}2)\}$

51. $\{(2,-1,\text{}3)\}$

53. $\{(-5,\text{}1,\text{}5)\}$

55. Treasury: $16,000; bonds: $48,000; fund: $26,000

57. $V=10,\text{}E=15,\text{}R=7$

59. $X=\left[\begin{array}{r}100\\ 100\end{array}\right]$

61. $X=\left[\begin{array}{l}{\displaystyle \frac{216\text{,}000}{277}}\\ {\displaystyle \frac{310\text{,}000}{277}}\\ {\displaystyle \frac{304\text{,}000}{277}}\end{array}\right]$

Get *College Algebra, 4th Edition* now with O’Reilly online learning.

O’Reilly members experience live online training, plus books, videos, and digital content from 200+ publishers.