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You have to give units of measurement for this kind of question. The number 61.8 does not in itself specify any number of feet, it's just a number.
Any number can be multiplied to get the answer 441. For example 5 can be multiplied by 88.2 If the question was which number can be multiplied by itself, the answers are: -21 and +21
That means that in the relation considered, any object relates to itself: For any "x", relation(x, x) is true. For example, this is a property of equality (any number is equal to itself), of congruence (any object is congruent to itself), and to relationships such as greater-than-or-equal (any number is greater than or equal to itself) and the non-strict subset relation (any set is a subset of itself).
cot(A+B+C) is, itself, a trigonometric function, so the question does not really make any sense!
Any number is divisble by 41. However, I suggest you be more specific in asking your question.