Answer:
32
Step-by-step explanation:
[tex] \triangle ABC \sim \triangle XYZ[/tex] (given)
[tex] \therefore \frac{AB}{XY} = \frac{BC}{YZ} [/tex] (csst)
[tex] \therefore \frac{68}{17} = \frac{a}{8} [/tex]
[tex] \therefore 4= \frac{a}{8} [/tex]
[tex] \therefore 4(8)= a [/tex]
[tex] \therefore a = 32 [/tex]
