I'm sort of having trouble doing this problem since I don't understand how to do it... Can anyone tell me how to solve this problem? http://img5.imageshack.us/img5/8251/11934715.jpg
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If T is the midpoint of SU that means that (1/2)SU = ST. You know how to find SU and ST in terms of x, so take it from there.
since we have T as the midpoint, by definition ST=TU
therefore, ST= 45, because ST=9x=9(5)=45
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