Place the numbers in descending order.

2.3 * 10 ^ - 10 3.2 * 10 ^ - 10 2.3 * 10 ^ - 12 2.3 * 10 ^ - 8

3.2 * 10 ^ -10, 2.3 * 10 ^ -10, 2.3 * 10 ^ -12, 2.3 * 10 ^ -8

To place these numbers in descending order, we should compare the powers of 10 first.

The numbers are:
2.3 * 10 ^ -10
3.2 * 10 ^ -10
2.3 * 10 ^ -12
2.3 * 10 ^ -8

Let's start by comparing the powers of 10.

The numbers with the greater power of 10 will come first.

2.3 * 10 ^ -10 (power of 10: -10)
3.2 * 10 ^ -10 (power of 10: -10)
2.3 * 10 ^ -12 (power of 10: -12)
2.3 * 10 ^ -8 (power of 10: -8)

Now, within the numbers that have the same power of 10, we will compare the coefficients.

2.3 * 10 ^ -10 (coefficient: 2.3)
3.2 * 10 ^ -10 (coefficient: 3.2)
2.3 * 10 ^ -12 (coefficient: 2.3)
2.3 * 10 ^ -8 (coefficient: 2.3)

Since 3.2 is greater than 2.3, the order becomes:

3.2 * 10 ^ -10
2.3 * 10 ^ -10
2.3 * 10 ^ -12
2.3 * 10 ^ -8

Therefore, the numbers in descending order are:
3.2 * 10 ^ -10, 2.3 * 10 ^ -10, 2.3 * 10 ^ -12, 2.3 * 10 ^ -8.

To place the numbers in descending order, we need to compare their values. In this case, all the numbers are in scientific notation, where a number is expressed as a decimal multiplied by a power of 10.

To compare numbers in scientific notation, it's important to compare the values of the decimals and the exponents separately.

Let's compare the decimals:
2.3
3.2
2.3
2.3

Starting with the largest decimal value, we have:
3.2

Next, let's compare the exponents:
10^-10
10^-10
10^-12
10^-8

Starting with the smallest exponent value, we have:
10^-12

Now, looking at the corresponding decimals and exponents, we have:
3.2 * 10^-10
2.3 * 10^-10
2.3 * 10^-12
2.3 * 10^-8

Therefore, the numbers in descending order are:
3.2 * 10^-10
2.3 * 10^-10
2.3 * 10^-8
2.3 * 10^-12