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A formula tells you how to work out something given another piece of information.
The formula F = 1.8C + 32 is used to convert a temperature in Centigrade to one in Fahrenheit.
When C = 10, we substitute this value into the formula to get:
F = 1.8 x 10 + 32
F = 18 + 32
F = 50
This means that 10º C is the same as 50º F