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c² = a² + b² - 2 a b cos C

2 a b cos C =  a² + b² - c²

cos C = (a² + b² - c²) / 2ab

C = arccos( (a² + b² - c²) / 2ab )

C = arccos( (17² + 8² - 16²) / (2 (17)(8) ) )

C ≈ 69.11°

69.1

51

step-by-step explanation:

73-22=51 the   mass number minus the amount of protons gives you the amount of neutrons

answ5

step-by-step explanation:

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