Question 1147161
QT is 11.


here's how it works out.


you are given that:


QS is 7 and RT is 6 and RS is 2.


since RS is 2, then QR is 5 and ST is 4.


going from left to right,  you get:


QR is 5, RS is 2, ST is 4.


add them up and you get 11.


my diagram shows the breakdown.


<pre>


     Q----------------R---------------S--------------T
              5               2               4

                      R---------------S
                              2
 
     Q--------------------------------S
                     7


                     R--------------------------------T
                                      6

</pre>


QR is 7 - 2 = 5
ST is 6 - 2 = 4