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The factors that multiply to 120 and add up to -8 are -12 and 10. This is because when you multiply -12 and 10, you get -120, and when you add them together, you get -8. Thus, the pair of factors you are looking for is (-12, 10).
1440 degrees. the formula is (n-2)*180, in this case (10 - 2) * 180 = 8 * 180 = 1440
8?n-2 (180)
15
Factors multiply, like 4 and 6 or 3 and 8 or 2 and 12.