To convert degrees Fahrenheit (°F) to degrees Celsius (°C), the correct equation is:
\[ °C = \frac{°F - 32}{1.8} \]
You can rearrange this equation to express °F in terms of °C, which gives:
\[ °F = 1.8°C + 32 \]
Now, to convert 77°F to °C using the conversion formula:
\[ °C = \frac{77 - 32}{1.8} = \frac{45}{1.8} \approx 25°C \]
Therefore, the correct response is:
\[ °F=1.8°C+32; 25°C \]