To arrange the numbers \(-32\), \(0.5\), \(9 - \sqrt{9}\), and \(-2\) on a number line, we first need to calculate \(9 - \sqrt{9}\).
We know that:
\[ \sqrt{9} = 3 \]
So,
\[ 9 - \sqrt{9} = 9 - 3 = 6 \]
Now we have the following numbers to arrange:
- \(-32\)
- \(-2\)
- \(0.5\)
- \(6\)
Next, we can sort these numbers in increasing order:
- \(-32\)
- \(-2\)
- \(0.5\)
- \(6\)
Thus, the numbers in order from least to greatest on the number line are:
\[ -32, -2, 0.5, 6 \]