The average temperature would be -2°Celsius
You just add up all the numbers, and the average of the numbers is the sum of all the numbers divided by the amount of numbers.
1+-6+14+-9+-15+8+-7=-14
-14/7=-2
The answer is zero (0), when you add any number to it's opposite you always get zero
21.00 you would take and fine the how much 40 percent of 35 is then subtract it so 35*40/100=14 35-14=21
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