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Test 4 Review Answers:
1. a) x = -7, b) x = -7
2. A = $1816.70
3. A = $1822.12
4. 
5. a) x = -2, b) x = 0, x = -2, x = 2
6. log 3 9 = 2
7. 2 -3 = 1/8
8. a) 2, b) 3
9. a) x = -3, b) x = -3, c) x = 3, x = -4
10. 2log x + log z - 3log y
11. log (3/(x+2))
12. a) x = 2/15, b) x = 4 (Note: x = - 9 is not a solution since you can not take a log of a negative number!)
13. a) x = (log 43)/(log 7), b) x = (log 15)/(log (9/5))
14. a) x = 301/195, b) x = 0.5 ln [(y + 1)/(y - 1)]
15. a) (3, -2), b) No Solution, c) (-2, 2)
16. a) infinite solutions in the form (x, 4 - 2x) or (.5y - 2, y),
b) ( -1, 3/2), c) (2/3, -3)
17. a) (2, 1, -1), b) (7/3, 8/3, -4/3)
Remember the story problem will come for either the investment problems or the word problems done in section 6.2
Good Luck!
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