0 Degrees Centigrade/Celsius equals 32 Degrees Fahrenheit
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Because the freezing point of water is zero-C but 32-F. The C-temp tells you (how many C-degrees above freezing it is), because C starts at zero. But the F-temp has to be 32 more than (how many F-degrees above freezing it is), because F starts at 32, not at zero.
ex+f = c -dx ex+dx = c -f x(e+d) = c -f x = c -f/(e+d)
You plug in the (degrees F), do the arithmetic, and wind up with the (degrees C).
°F to °C: [°C] = ([°F] − 32) × 5⁄9°C to °F: [°F] = [°C] × 1.8 + 32
a. 40 THE ANSWER IS 40 b. x c. 20 d. f(x)