Question 1081587
In parallelogram {{{WXYZ}}}, {{{WY = 12in}}}, {{{XZ = 16in}}}, {{{WX =10in}}}, and {{{XY = 9in}}}. 

<a href="http://tinypic.com?ref=2nrfsed" target="_blank"><img src="http://i64.tinypic.com/2nrfsed.jpg" border="0" alt="Image and video hosting by TinyPic"></a>

on that picture,{{{XZ = 2b}}} ; so {{{MX=b}}}

since given {{{XZ = 16in}}}, and {{{MX=XZ/2 = 16 in/2=8in}}}

answer is: {{{8in}}}