To simplify this fraction, first find the greatest common factor between them. The factors of 24 are [1, 2, 3, 4, 6, 8, 12, 24] and the factors of 72 are [1, 2, 3, 4, 6, 8, 9, 12, 18, 24, 36, 72]. They share 8 factors [1, 2, 3, 4, 6, 8, 12, 24] making 24 their greatest common factor (GCF).

Next, divide both numerator and denominator by the GCF:

\( \frac{24}{72} \) = \( \frac{\frac{24}{24}}{\frac{72}{24}} \) = \( \frac{1}{3} \)

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

3\( \sqrt{12} \) - 8\( \sqrt{3} \)
3\( \sqrt{4 \times 3} \) - 8\( \sqrt{3} \)
3\( \sqrt{2^2 \times 3} \) - 8\( \sqrt{3} \)
(3)(2)\( \sqrt{3} \) - 8\( \sqrt{3} \)
6\( \sqrt{3} \) - 8\( \sqrt{3} \)

Now that the radicands are identical, you can subtract them:

A rational number (or fraction) is represented as a ratio between two integers, a and b, and has the form \({a \over b}\) where a is the numerator and b is the denominator. An improper fraction (\({5 \over 3} \)) has a numerator with a greater absolute value than the denominator and can be converted into a mixed number (\(1 {2 \over 3} \)) which has a whole number part and a fractional part.

By buying two shirts, Ezra will save $33 x \( \frac{20}{100} \) = \( \frac{$33 x 20}{100} \) = \( \frac{$660}{100} \) = $6.60 on the second shirt.