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Mathematics 8 Online
OpenStudy (anonymous):

http://hotmath.com/help/bookindexes/cpmg06new/index.html#pid=cpmg06new_7_1-3_Homework_7-33d_348

OpenStudy (anonymous):

k² = 15² + 25² - 2* 15*25 cos 120 = > k = 15.5

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