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Factors of 84:
1 x 84 => 1 + 84 = 85
2 x 42 => 2 + 42 = 44
3 x 28 => 3 + 28 = 31
4 x 21 => 4 + 21 = 25
7 x 12 => 7 + 12 = 19
Answer: 7 and 12.
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To find the sum of two mixed numbers, turn the mixed numbers into improper fractions (multiply the base with the denominator and add the numerator), then add the two fractions. To add the two fractions, find the LCD (lowest common denominator) and add the two numerators, but leave the denominators the same.
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To find two numbers that multiply to -100 and add up to -25, we can set up a system of equations. Let's call the two numbers x and y. We have the equations xy = -100 and x + y = -25. By solving these equations simultaneously, we can find that the two numbers are -20 and 5.