Question

This expression, 1.8C + 32, shows how to convert from degrees Celsius to degrees Fahrenheit, where C represents the temperature in degrees Celsius. What is the temperature in degrees Fahrenheit when the temperature is 25°C?

Answer 1

Just plug it in, they already gave you the equation.
1.8C + 32 = F
1.8(25) + 32 = F
45 + 32 = F
77 = F
77 degrees F

Answer 2

1.8C +32
1.8x25 +32
45 + 32
77 degrees Fahrenheit.