Multiplying a number by 3 1/2 does not necessarily increase its value so the question is based on nonsense.
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Dividing by twelve is the same thing as multiplying by 1/12. Thus, multiplying a number by 12/1, or twelve, is the opposite (inverse) of dividing a number by twelve.
3
4, 8, 12, 16, and any other number you can get by multiplying 4 by a whole number.
12 Absolute value means "how far is it from zero on the number line".
72.: You can get the answer by multiplying the number of inches in a foot (12) by the number of feet you are wondering about.72 inches.