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Answer :

Answer:

RS  =  75.3

Step-by-step explanation:

You need to set up the proportion of corresponding sides.

[tex]\frac{PQ}{ST} = \frac{PO}{RS}[/tex]

[tex]\frac{7}{31} = \frac{17}{RS}[/tex]

7(RS) = 31(17)

         =  527

RS = 527/7 = 75.2857...

     =  75.3