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Answers ReviewTest2fall07

Answers ReviewTest2fall07 - 16 3 1 33 gallons of the 80...

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Answers to practice problems on Test #2 Review 1. a) (−2, 5); b) ( 29 23 11 23 25 , - ; c) inconsistent (the lines are parallel) 2. x x x x 9 2 8 3 5 7 + - + - ; leading coefficient: −8; degree: 7 3. a) 16 3 2 3 + - - x x b) 4 9 9 3 - + - x x 4. a) 3 7 4 y x b) 4 3 3 4 y x 5. a) x x x 9 15 6 2 3 + - ; b) 12 11 15 2 - - x x ; c) 15 32 16 25 20 2 3 4 + - + - s s s s d) 2 2 9 12 4 y xy x + + 6. a) ) 5 2 ( 3 2 v v + b) (4y – 7)(4y + 7) c) ) 5 4 )( 3 2 ( - + x x d) 2 ) 8 ( ) 8 )( 8 ( + = + + y y y e) (x – 4)(x – 8) f) (4x – 7)(3x + 2) 7. a) s = 2, s = 3 4 - ; b) x 4 7 - = , x = 0; c) x = 10, x = 15; d) y = 6, y = -12 8. a) 72 1 b) 81 c) 240,000 9. a) 5 10 38 . 5 - b) 10 10 0296 . 3 10. a) 483,300,000 b) 0.000274 11. a) 3 27 y b) 4 a c) 5 2 3 x d) ) 5 ( 2 + x x e) 3 1 - x 12. a) x y 8 b) ) 4 ( 2 4 - + x x 13. a) x y 125 b) 7 ) 1 ( - - x x x 14. a) 3 1 ) ) 1 ( 5 8 - - x x x 15. $13,000 is invested at 8%; $12,000 is invested at 8.5%.
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Unformatted text preview: 16. 3 1 33 gallons of the 80% solution is mixed with 3 2 16 gallons of the 50% solution. 17. The bus must travel 45 minutes longer at an average speed of 60 mph. 18. Alpha Andromeda is approximately 17 10 505 . 8 × meters from earth. 19. D: t ≠-12 20. The length of the rectangle is 24 inches. Its width is 18 inches. 21. The object will reach the ground after 2 seconds. 22. No. 4 4 , 4 4 4 1--=-a not a a . 23. The length of the rectangle is 32 – w ....
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