Answer Key Lesson 6.3 Practice Level B 1. 6x 1/2 1 2 2. 3x 1/2 2 1 3. 25x 1/2 1 5 4. 8x 1/2 2 6 5. 211x 1/2 1 3 6. 3x 1/2 1 3

4x 2/3 7. 212x 10/3 8. 4x 5/2 9. 23x 11/6 10. 2} 3 1 3x 1 9 6 1 11. } 12. 2} 13. } 14. } x17 x11 3x 5/6 4x 3/2 3 3x 1 3 15. x 1 8 16. } 17. x 1 4 18. } 2x 1 4 x14 19. all real numbers 20. all real numbers except x 5 23 21. all real numbers except x 5 23

2 22. all real numbers except x 5 2} 3 23. all real numbers 24. all real numbers 25. f(x) 5 x 2 200 26. g(x) 5 0.8x 27. g( f (x)) 5 0.8x 2 160 28. f(g(x)) 5 0.8x 2 200 29. pay less with discount first