ANSWER :
x = 13
EXPLANATION :
Note that if two polygons are similar, the ratio of their corresponding sides is equal.
x - 3 corresponds to 2.5
and 8 corresponds to 2
So that will be :
[tex]\begin{gathered} \frac{x-3}{2.5}=\frac{8}{2} \\ \text{ Cross multiply :} \\ 2(x-3)=2.5(8) \\ 2x-6=20 \\ 2x=20+6 \\ 2x=26 \\ x=\frac{26}{2}=13 \end{gathered}[/tex]
