## Physics: Principles with Applications (7th Edition)

The temperature is -40$^{\circ}$. $$-40^{\circ} F=-40^{\circ} C$$
Use either formula on page 362, setting the temperature equal to itself. $$\frac{9}{5}(X) + 32 = X$$ $$\frac{4}{5}(X) = -32$$ $$X = -40$$ $$-40^{\circ} F=-40^{\circ} C$$