LESSON

NAME _________________________________________________________ DATE ___________

12.3

Practice A For use with pages 704–709

Isolate the radical expression on one side of the equation. Do not solve. 1. x  2  4  8

2. x  7  9

4. 5x  4  3  1

5.  2x  1  0

7.



1 2x

457

8. 4  x 

3 4

3. x  7  2  0



6. 8  x  4

5 4

9. 2x  4  8

Solve the equation. Check for extraneous solutions. 10. x  5  0

11. x  7  0

12. x  3  12

13. x  14  8

14. x  6  0

15. 2x  0

16. x  3  2

17. 2x  5  13

18. x  2  8

19. 2x  1  0

20. 8x  1  5

21. 4x  1  3  0

22. 3x  5  7  3

23. x  2  x  4

24. 5x 2  7  2x

25. Water Flow

You can measure the speed of water using an L-shaped tube. The speed V of the water in miles per hour is V  2.5h where h is the height of the column of water above the surface in inches. If you use the tube in a river and find that h is 5 inches, what is the speed of the water to the nearest tenth of a mile per hour?

26. Cylindrical Rod

The radius r, the height h, and the surface area A of a cylinder are related by the equation r

2A  rh.

What is the radius of a rod whose surface area is 50 square inches and height is 24 inches? 24 in.

h r V

Lesson 12.3

27. Find the value of x if the perimeter is 24.

4

x8

Copyright © McDougal Littell Inc. All rights reserved.

Algebra 1 Chapter 12 Resource Book

35

Practice A

25. Water Flow You can measure the speed of water using an L-shaped tube. The speed V of the water in miles per hour is where h is the height of the column of ...

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