Question

X² = 30² +21² -2(30)(21) Cos 123°

Answer 1

x ≈ 44.69

Explanation:

x² = 30² +21² -2(30)(21)Cos123°

x² = 900 + 411 - 1260cos123°

x² = 1311 - 1260cos123²

~Take square root of both sides

x = √1997.245184111

x ≈ 44.69

Best of Luck!