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To evaluate the expression \( \sqrt{100 - 36} \):
1. First, calculate \( 100 - 36 \):
\[
100 - 36 = 64
\]
2. Next, find the square root of 64:
\[
\sqrt{64} = 8
\]
Since both calculations result in a valid real number, we conclude that the expression is a real number.
The correct choice is:
A. The expression is a real number. \( 100 - 36 = 64 \)