The temperature at 9 a. m. was 13.6°C. The temperature at 9 p. m. was 6.4°C. The temperature at 3 a. m. was 23.5°C. What was the average change in temperature from 9 a. m. to 9 p. m.?

The average change in temperature from 9 a.m to 9 p.m is - 0.6 °  per hour (negative indicates temperature decreases), if the temperature at 9 a.m was 13.6 ° and the temperature at 9 p.m was 6.4 °.

Step-by-step explanation:

            The given is,

                       The temperature at 9 a.m was 13.6 °

                      The temperature at 9 p.m was 6.4 °

                       The temperature at 3 a.m was 23.5 °

Step:1

           Hours difference between 9 a.m to 9 p.m is,

                                   = 12 hours          (∵ consider a clock for this calculation)

Step:2

           Temperature difference between 9 a.m to 9 p.m is,

                                   =  6.4 - 13.6

                                   = - 7.2 °

Step:3

          Average change in temperature between 9 a.m to 9 p.m,

                                    = - 0.6 °            ( ∵ Negative indicates temperature reduction)

Result:

          The average change in temperature from 9 a.m to 9 p.m is - 0.6 °  per hour ( Negative indicates temperature reduction).

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step-by-step explanation: