Here's how to convert -10 degrees Celsius to Fahrenheit:

Formula:

* °F = (°C × 9/5) + 32

Calculation:

1. Multiply Celsius by 9/5: -10 °C × 9/5 = -18

2. Add 32: -18 + 32 = 14

Answer: -10 degrees Celsius is equal to 14 degrees Fahrenheit.