What is the average rate of change of temperature with respect to time over the evening hours from 6 pm to 10 pm? interpret this value in a complete sentence.

Assuming that the values are:

34 degrees = 6pm
30 degrees = 8pm
28 degrees = 10pm

With respect of the temperature, the formula you should first use is y/x

where in it is 34-38/6-10 = -6 degress Fahrenheit/4 hours = -1.5 Fahrenheit, meaning that the temperature decreases every hour.   

The sun's corona can be seen during a solar eclipse.