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99 + 9/9 = 100
(4*4)+(4/4) parentheses are not needed
Yes. Assuming you can use any mathematical formula that only uses four fours, you can take the square root of four (2) plus four (6) plus four over four, which simplifies to 1 over one, which is one, you simply get two plus four plus one, or seven
No, a drop of water isn't even the same as another drop of water. They come in different sizes and aren't adequate for precision uses. For an amazing drop search "Pitch drop experiment".
Any quadrilateral.