Question

the daily low temperature readings for a five-day period were as followed -13, -5 ,6, -7, 9 find the average low temperature for the five day period

Answer 1

First add the numbers together:
-13+(-5),6,(-7),9=-10
Then divide that number by the total # of numbers, which is 5
-10÷5=-2

The average low temperature is -2.

...which is 6th grade stuff, so I am having a hard time believing, that you are in college and/or are having problems with this.