Answer:
[tex]x=12\ units[/tex]
Step-by-step explanation:
we know that
If two figures are similar, then the ratio of their corresponding sides is equal
so
In this problem
[tex]\frac{x}{24}=\frac{10.5}{21}[/tex]
[tex]x=24\frac{10.5}{21}[/tex]
[tex]x=12\ units[/tex]
