The GCF is 2.
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Any positive number can be a GCF. But for each separate set of numbers, there can only be one.
Because odd numbers don't have any even factors so they can't have any in common.
Any two integers have a gcf. It is also possible for an odd and an even number to have a gcf other than one; for example, the following numbers (shown in factored form) have the gcf 7: 7 x 7 7 x 8 ex. 3 and 6, the GCF is 3 14 and 21 the GCF is 7
yes
Any number, positive or negative, raised to an even-numbered power, returns a positive number.