Since numbers don't stop, then factors don't stop, then proper factors don't stop. It's impossible to quantify an infinite answer.
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The sum of a negative integer and a positive integer is zero only when the two integers have the same absolute value. For example, if you have -3 (negative integer) and +3 (positive integer), their sum is zero. However, in general, this situation occurs infrequently since it requires specific values. Most of the time, the sum will be a negative integer if the absolute value of the negative integer is greater than that of the positive integer, and a positive integer if the opposite is true.
The sum will be a positive integer.It will be at least as large as double the smaller integer and at most as large as double the larger integer.
some are but most are not. There are actually an infinite number that are, 13, 26, 39, 52, etc. are all divisible by 13.
There is no limit to the number of obtuse angles a figure can have. A regular n-gon has n obtuse angles where n is any positive integer greater than 4.
It most certainly can.