Answer:
b). 18.3
Explanation:
c² = a² + b² - 2bc (cos A)
= 12.4² + 9.9² - 2(12.4) (9.9) x cos(110)
= 153.76 + 98.01 - 245.52 x cos(110)
= 251.77 - 245.52 x -0.342
c² = 251.77 + 83.97
c² = 335.74
c = 18.3
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