The temperature of a chemical solution is originally 21∘C21∘C21, degrees, start text, C, end text. A chemist heats the solution at a constant rate, and the temperature of the solution is 75∘C75∘C75, degrees, start text, C, end text after 121212 minutes of heating. The temperature, TTT, of the solution in ∘C∘Cdegrees, start text, C, end text is a function of xxx, the heating time in minutes. Write the function's formula. T=

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Domain

In simple mathematics terms, a domain is defined as the space on which all the possible inputs for the function will lie. It can also be expressed as a set of departures for the required function.