can you give me some advise how to do on this question? what the best formula can I use to solve it ?

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can you give me some advise how to do on this question? what the best formula can I use to solve it ?

How much taller does the Eiffel Tower become at the end of a day when the temperature has increased by 15*c ? Its original height is 321 m and you can assume it is made of steel