To place the numbers in descending order, we can first compare the exponents and then the coefficients.
The numbers are:
- \( 2.3 \times 10^{-10} \)
- \( 3.2 \times 10^{-10} \)
- \( 2.3 \times 10^{-12} \)
- \( 2.3 \times 10^{-8} \)
Now, let's compare them based on their powers of 10:
- \( 2.3 \times 10^{-8} \) (highest exponent)
- \( 3.2 \times 10^{-10} \) (next highest exponent)
- \( 2.3 \times 10^{-10} \)
- \( 2.3 \times 10^{-12} \) (lowest exponent)
Now, putting them in descending order:
- \( 2.3 \times 10^{-8} \)
- \( 3.2 \times 10^{-10} \)
- \( 2.3 \times 10^{-10} \)
- \( 2.3 \times 10^{-12} \)
So the final order is:
2.3 × 10−8, 3.2 × 10−10, 2.3 × 10−10, 2.3 × 10−12.