To convert degrees Celsius (°C) to degrees Fahrenheit (°F), you can use the formula:
\[ °F = (°C \times \frac{9}{5}) + 32 \]
Plugging in 40°C:
\[ °F = (40 \times \frac{9}{5}) + 32 \] \[ °F = (40 \times 1.8) + 32 \] \[ °F = 72 + 32 \] \[ °F = 104 \]
So, 40°C is equal to 104°F.