Answer:
9.6
Step-by-step explanation:
As YZ is parallel to VX, then ΔWYZ ≅ ΔWVX
⇒ WX : WV = WZ : ZX
⇒ 5.6 : (5.6 + 8.4) : 6.4 : (6.4 + J)
[tex]\implies \dfrac{5.6}{5.6+8.4}=\dfrac{6.4}{6.4+J}x^{2}[/tex]
[tex]\implies 5.6(6.4 + J)=6.4 (5.6+8.4)[/tex]
[tex]\implies 35.84+5.6J=89.6[/tex]
[tex]\implies 5.6J=53.76[/tex]
[tex]\implies J=9.6[/tex]
