Final answer:
The expression that could not be used to evaluate 25 · 18 is D) 18 + (20 · 5).
Step-by-step explanation:
The expression that could not be used to evaluate 25 · 18 is D) 18 + (20 · 5). To evaluate this expression, we need to perform the multiplication first. Multiplying 20 and 5 gives us 100. Then, we add 18 to 100, resulting in 118. However, the correct answer to the multiplication problem is 450, not 118. Therefore, option D) is the expression that could not be used to evaluate 25 · 18.