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