tolong dijawab yaaaaa
Jawaban:
C. 78⁰
Penjelasan dengan langkah-langkah:
<A + <B + <C = 180⁰
39 + (4 × -6) + 3x = 180⁰
7x + 33 = 180⁰
7x = 180⁰ - 33
7x = 180⁰ - 33
x = 147/7 = 21⁰
<B = 4× -6
= 4 (21) - 6
= 84 - 6
= 78⁰ c.
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