Rutgers/Lucent ALLIES IN TEACHING MATHEMATICS AND TECHNOLOGY Grant
Using technology not simply to do things better, but to do better things.


EXPLORING THE TI-83 GRAPHING CALCULATOR

Converting Celsius Temperatures to Fahrenheit

To convert a temperature from degrees Celsius (C ) to degrees Fahrenheit (F ), we use the formula


F = (9⁄5)C + 32.


Outside of the United States, temperature readings are usually given in degrees Celsius. A rough approximation of the Fahrenheit equivalent for a Celsius reading can be found by doubling the Celsius reading and adding 32°.

  1. Write a formula to calculate the Fahrenheit approximation, F , of a Celsius temperature, C .

  2. For what range of Fahrenheit temperatures, if any, is the approximation less than (or greater than) the correctly calculated value?

  3. For what temperature, if any, is the approximation the same as the correctly calculated temperature?



You can use the graphing calculator to help answer the questions.



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