Respuesta :

Answer:

Step-by-step explanation:

[tex]\frac{XY}{PQ}=\frac{YZ}{QR}\\\\\frac{19.5}{6.5}=\frac{10.5}{k}\\\\[/tex]

Cross multiply,

19.5*k = 10.5 * 6.5

[tex]k =\frac{10.5*6.5}{19.5}\\\\k=3.5[/tex]