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The given problem is to evaluate the expression:

\[
\frac{a - b}{c - d}
\]

with the values:

- \( a = 13 \)
- \( b = 5 \)
- \( c = 4 \)
- \( d = 2 \)

First, substitute the values into the expression:

\[
\frac{13 - 5}{4 - 2} = \frac{8}{2}
\]

Now, simplify:

\[
\frac{8}{2} = 4
\]

So, the solution is \( 4 \).

Would you like a more detailed explanation, or do you have any questions?

Here are five related questions:
1. What happens if one of the values is negative?
2. How would the answer change if \( a = 10 \) and \( b = 3 \)?
3. What if the denominator \( c - d \) is zero?
4. Can you generalize this expression for any values of \( a \), \( b \), \( c \), and \( d \)?
5. How does this expression relate to basic fraction simplifications?

**Tip**: Always check that the denominator is not zero to avoid undefined expressions in fraction problems.

Evaluate the expression (a - b) / (c - d) for the given values of a, b, c, and d: a = 13, b = 5, c = 4, d = 2.

Learn how to evaluate the expression (a - b) / (c - d) with a step-by-step solution. Given values: a = 13, b = 5, c = 4, and d = 2. The solution demonstrates basic arithmetic and fraction simplification concepts, suitable for students in Grades 5-7.

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