he formula given below gives the expansion I of a particular highway of length L at a temperature of T degrees Fahrenheit. The variable t stands for the temperature at which the highway was built. If a 2​-mile stretch of highway was built at an average temperature of 60°F​, what is the maximum temperature it can withstand if expansion joints allow for 7.4 ft of​ expansion? (Hint: The units of L must be the same as the units of I and remember that 1 mile=5280 feet.​)

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