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'key's" As in, "The key's metal surface was beginning to corrode".
No, it is a plural noun, or less commonly a verb (form of 'to key'). The singular noun key is also an adjective, but it has no adverb form.
I use my left pinky to press and hold "Shift" and press the question mark key with my right pinky.
Alternate Key
The square root can be indicated by a check mark. √49 = 7, -7