X=7 and all the sides are equal so just plug it in to get 13
<h2>✏Answer ✏</h2>
<em>The short answer is to reduce the uncertainty in your measurement of the period. ... If you are using a stopwatch and manual timing- then your uncertainty in timing an interval is likeley to be about say 0.2 s . If the period of the pendulum is about 1 second then 0.2 s uncertainty corresponds to about 20% .</em>
Explanation:
<em>#</em><em> </em><em>Brainliest Bunch</em><em> </em>
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