An awful lot.
The amount of "powder" added to a case can have several effects.
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Do you mean the difference? The difference is 13.
It does not mean anything at all. "Twice a number" is only one number while "the difference" must refer to two numbers, not just one.
If you mean the difference between -11 and 2*(-11), then it's 11.
mode is the number that occurs the most and to find the mean/average, add all numbers, then divid that number by the number of numbers there were in your group of numbers.
the mean is the average of all the salaries an the the median is the number that falls in the middle