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= (9/5.x°C)+32° F
°C ke °F akan menunjukkan skala yg sama pada angka -40°:
4/5 dari x°C = -32°
= 5/4.-32°
= -40°
jadi, -40°C = -40°F
= (9/5.-40°C)+32°
= -72°+32° = -40°F
jadi jawaban nya B. -40° C