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Example 5

b. 8. SOLUTION. Keystrokes. Display. Answer. a. [. ]. 56.25. –. –. 7.5. 7.5. b. [. ]. 8. 2.828427125. 2.8. c. [. ]. 1256. –. –. 35.44009029. 35.4. Example 5. Using a Calculator. Evaluate the square root. Round to the nearest tenth if necessary. a. c. –. 56.25. –.

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Example 5

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  1. b. 8 SOLUTION Keystrokes Display Answer a. [ ] 56.25 – – 7.5 7.5 b. [ ] 8 2.828427125 2.8 c. [ ] 1256 – – 35.44009029 35.4 Example 5 Using a Calculator Evaluate the square root. Round to the nearest tenth if necessary. a. c. – 56.25 – 1256

  2. r r SOLUTION Write model for speed of the ride. 2.61 Substitute 2.61 for r. s s 4.95 4.95 4.95 = = = Example 6 Using a Square Root in Real Life AMUSEMENT PARKS The model gives the speed needed to keep riders pinned to the wall of an amusement park ride. In the model, s is the speed (in meters per second) and r is the radius of the ride (in meters). Find the speed necessary to keep riders pinned to the wall of a ride that has a radius of 2.61 meters.

  3. ANSWER Multiply. 8.019 = The speed should be about 8 meters per second. ( ) 1.62 Example 6 Using a Square Root in Real Life Approximate the square root using a calculator. 4.95 ≈

  4. Guided Practice 236 15.4 ANSWER 11. WHAT IF?In Example 6, what is the speed necessary to keep riders pinned to the wall of a ride that has a radius of 3.56 meters? Round your answer to the nearest tenth of a meter per second. 9.3 m per sec ANSWER for Examples 5 and 6 10. Use a calculator to evaluate to the nearest tenth.

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