$1.70\times 10^2 \textrm{ m}$. The decrease in height is negligible.

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This is College Physics Answers with Shaun Dychko. The final height of the Washington monument will be its initial height plus its change in height based on the change in temperature. So that's going to be <i>Li</i> plus this expansion coefficient times the initial length times the change of temperature. And we can factor out <i>Li</i> from both of this terms and we get <i>Li</i> times one plus alpha delta <i>T</i>. So the final height will be 170 meters that it started with times one plus the expansion coefficient of marble which is two and a half times ten to the minus six per Celsius degree and then times by the change in temperature. So that's negative ten degrees Celsius final temperature minus thirty five degrees Celsius initial temperature and we get 169.98 meters which rounds to 1.70 times ten to the two meters when you have three significant figures. And so the height essentially hasn't change in any really measurable way, but you know maybe, it slightly decreased.