Can you help me with this math problem by giving me a step-by-step solution? here it is below:

Question

Evaluate the expression, or state that the expression is not a real number.

squareroot 169-144

Select the correct choice below and, if necessary, fill in the answer box to complete your choice.

A. The expression is a real number. 169- 144 = blank (Type an integer or a decimal.)
B. The expression is not a real number.

Answer 1

Let's evaluate the expression step-by-step.

The expression given is:

\[ \sqrt{169 - 144} \]

1. First, calculate \(169 - 144\): \[ 169 - 144 = 25 \]

2. Now, substitute this result back into the square root: \[ \sqrt{25} \]

3. Next, evaluate the square root: \[ \sqrt{25} = 5 \]

Since we have evaluated the expression and found that it is a real number:

• The correct choice is A. The expression is a real number.
• The result of \(169 - 144\) is \(25\).

So, the filled answer is:

\[ A. \text{The expression is a real number. } 169 - 144 = 25 \]