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Q: Add numbers to equal 21

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-5 and -16

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The numbers are: 21 and -10

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21 and 22 add to 43

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14 plus 14,8 plus 20,9 plus 21

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21 and 21 equal 42.

Two factors of 110, 11 and 10, equal 21 if you add them.

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-3888

25

if you mean their product is 21, then 7x3=21

Unfortuanately, you can't factor this polynomial. To do so, you must find a pair of numbers that add up to the coefficient of the middle term, and multiply to equal the product of the coefficients of the first and last terms. In other words, we want a pair of numbers that add up to make -11, and multiply to make 21. Unfortunately there are no natural numbers that meet that condition.

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You cannot. The sum of all the numbers between 1 and 6 is infinite because there are infinitely many such numbers. The sum of all the integers is 21 and nothing will change the fact that they add up to that value.

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The numbers are: 3 -sq rt of 21 and 3 +sq rt of 21

10.5 + 10.5 = 21

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