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4. (5 pts.) A piece of steel rail is exactly 5000 ft. long at 25 F. Find the length of the rail on a sunny

4. (5 pts.) A piece of steel rail is exactly 5000 ft. long at 25 F. Find the length of the rail on a sunny winter's day when the temperature is 40 F given the steel's a = 6.5 x 10*in./in./ F

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