Let's classify the numbers from the table as either rational or irrational:

1. −18π:

   • π (pi) is an irrational number because it cannot be expressed as a fraction of two integers.
   • −18π is the product of an irrational number (π) and a rational number (−18), which results in an irrational number.

2. −2√3:

   • √3 (square root of 3) is irrational because it is not a perfect square and cannot be expressed as a fraction.
   • −2√3 is the product of a rational number (−2) and an irrational number (√3), which results in an irrational number.

3. −92.45:

   • This is a terminating decimal, which can be expressed as a fraction (−9245/100), meaning it is a rational number.

4. √49:

   • √49 (square root of 49) is a perfect square, equal to 7, which is a rational number.
   • So, √49 is a rational number.

5. −70.49:

   • This is a terminating decimal, which can be expressed as a fraction (−7049/100), meaning it is a rational number.

Final classification:

• −18π → irrational
• −2√3 → irrational
• −92.45 → rational
• √49 → rational
• −70.49 → rational

Would you like any further details or explanations?

Here are 5 related questions you might want to consider:

1. What is the difference between rational and irrational numbers?
2. How do you prove that a number like π is irrational?
3. Are all square roots irrational?
4. How can you express a terminating decimal as a fraction?
5. What happens when you multiply a rational number by an irrational number?

Tip: Remember, any terminating or repeating decimal is always rational because it can be expressed as a fraction!