Question 162328
Volume for a rectangular solid is length times width times height. 
Since one of your measurements is mixed feet and inches, we need to convert that measurements to feet.
{{{W=13+2/12=156/12+2/12=158/12=79/6}}}
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{{{V=LWH=12(79/6)(8)}}}
{{{V=1264}}}
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The room has a volume of 1264 cubic feet.