Select the correct choice below and, if necessary, fill in the answer box to complete your answer. A. The expression is a real number. \( \sqrt{100}= \) B. The expression is not a real number.

A. The expression is a real number. \( \sqrt{100} = 10 \) This is because the square root of a positive number is always defined as a real number. In this case, 10 multiplied by itself gives you 100, confirming that the square root is indeed real and well within the realm of simple arithmetic. Fun fact: The concept of square roots dates back to ancient civilizations, like the Babylonians around 2000 BCE, who used methods remarkably similar to our modern techniques! It’s fascinating how math has connected us across time.