The correct equation to convert degrees Fahrenheit (°F) to degrees Celsius (°C) is:
\[ °C = \frac{°F - 32}{1.8} \]
To find out what 77°F is in °C, we can substitute 77 into the equation:
\[ °C = \frac{77 - 32}{1.8} \] \[ °C = \frac{45}{1.8} \] \[ °C = 25 \]
So, 77°F is equal to 25°C.
The answer choices and the correct calculation confirm:
- The equation \( °C = \frac{°F - 32}{1.8} \) is used for converting °F to °C.
- 77°F converts to 25°C.
The final answer is 25°C.