Verified answer

To arrange the given expressions in descending order, we need to compare their values.

1. Let's simplify each expression:

- 2√3√5: This expression can be simplified as 2 times the square root of 3 times the square root of 5. We can multiply the square roots together to get the square root of the product of 3 and 5, which is the square root of 15. So, 2√3√5 becomes 2√15.

- 3√4√7: Similarly, this expression can be simplified as 3 times the square root of 4 times the square root of 7. The square root of 4 is 2, so 3√4√7 becomes 3 times 2 times the square root of 7, which is 6√7.

- √√3: This expression can be simplified by taking the square root of the square root of 3. The square root of 3 is approximately 1.732, so √√3 becomes √1.732.

2. Now, we can compare the simplified expressions:

- 6√7 is the largest expression since it has the highest numerical value.

- √1.732 is the next largest expression.

- 2√15 is the smallest expression since it has the lowest numerical value.

Therefore, the expressions arranged in descending order are:

6√7, √1.732, 2√15