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6x+5x+4+9=90
11x+13=90
11x=90-13
11x=77
x=7
11x + 13 = 90
11x = 90 - 13
11x = 77
x = 7
Penyiku sudut AQC = sudut BQC
= 5x + 9
= 5 × 7 + 9
= 35 + 9
= 44
Jadi, jawabannya B. 44°