Here's how to convert 6.4 degrees Celsius to Fahrenheit:

Formula:

Fahrenheit = (Celsius * 9/5) + 32

Calculation:

1. Multiply Celsius by 9/5: 6.4 * (9/5) = 11.52

2. Add 32: 11.52 + 32 = 43.52

Therefore, 6.4 degrees Celsius is equal to 43.52 degrees Fahrenheit.