asap help

#1 is propably a and #2 is propably b

We have the following relationship

 ΔPQR  similar to  ΔQTR  similar to  ΔPTQ

Note  that

PT            QT

___   =     ___

TQ            TR

So... "A"  is correct

We  have  that

16             x

___   =    ___      cross-multiply

  x             9

16 * 9  =  x^2

144 = x^2     take the positive root of both sides

12  =  x