To fill a 9 gallon tank exactly halfway you'll need 4\(\frac{1}{2}\) gallons of fuel. Each fuel can holds 1\(\frac{1}{2}\) gallons so:

cans = \( \frac{4\frac{1}{2} \text{ gallons}}{1\frac{1}{2} \text{ gallons}} \) = 3

Calculate the number of vans needed by dividing the number of people that need transported by the capacity of one van:

vans = \( \frac{51}{10} \) = 5\(\frac{1}{10}\)

So, it will take 5 full vans and one partially full van to transport the entire team making a total of 6 vans.

The commutative property states that, when adding or multiplying numbers, the order in which they're added or multiplied does not matter. For example, 3 + 4 and 4 + 3 give the same result, as do 3 x 4 and 4 x 3.

To add these radicals together their radicands must be the same:

4\( \sqrt{125} \) + 3\( \sqrt{5} \)
4\( \sqrt{25 \times 5} \) + 3\( \sqrt{5} \)
4\( \sqrt{5^2 \times 5} \) + 3\( \sqrt{5} \)
(4)(5)\( \sqrt{5} \) + 3\( \sqrt{5} \)
20\( \sqrt{5} \) + 3\( \sqrt{5} \)

Now that the radicands are identical, you can add them together:

There are 4 4-passenger taxis available so that's 4 x 4 = 16 total seats. There are 21 people needing transportation leaving 21 - 16 = 5 who will have to find other transportation.