Teddy is staying in Canada. He wants to set the thermostat to around 79°F, but the thermostat is marked only in °C. Where should he set the thermostat, to the nearest tenth? (C = 5/9 (F - 32))

Use the conversion formula C = 5/9(F − 32). For 79°F, C = 5/9(79 − 32) = 5/9 × 47 ≈ 26.1°C. He should set the thermostat to 26.1°C, which is choice b.

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