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Verified Answer :

Its 12 because you do 10.5/21=x/24

Answer:

\(x=12\ units\)

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

\(\frac{x}{24}=\frac{10.5}{21}\)

\(x=24\frac{10.5}{21}\)

\(x=12\ units\)