(1, 12x), (2, 6x), (3, 4x), (4, 3x), (6, 2x) and (12, x).
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16X + 12X all I can see here is factoring out a 4X factor 4X(4 + 3) ---------------
The GCF is 3x.
The factor pairs of 20 are pairs of numbers that can be multiplied together to give 20. The factor pairs of 20 are (1, 20), (2, 10), and (4, 5). These pairs represent all the possible combinations of numbers that can be multiplied to equal 20.
The factor pairs of 28 are :28,114,27,4
1x6, 2x3