book Maths Puzzle Numerical Ability

PLEASE SHOW ME HOW DO I USE FOUR 4'S USING ANY MATHEMATICAL OPERATION.AND YOU MAY USE EXPONETS, FACTIONS, SQUARE ROOTS, DECIMAL POINTS, NEGATIVE NUMBERS, AND FACTORIALS.
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Give an example of a sum of a negative number and a positive number that is negative. I need to know the following question: "Who found the twenty-fifth number and in what year? Who found the twenty-sixth number and in what year?" I have tried to look all over the I