Average speed in miles per hour is the number of miles traveled divided by the number of hours:

Solving for time:

time = \( \frac{\text{distance}}{\text{speed}} \)
time = \( \frac{200mi}{25mph} \)
8 hours

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

4\( \sqrt{20} \) - 6\( \sqrt{5} \)
4\( \sqrt{4 \times 5} \) - 6\( \sqrt{5} \)
4\( \sqrt{2^2 \times 5} \) - 6\( \sqrt{5} \)
(4)(2)\( \sqrt{5} \) - 6\( \sqrt{5} \)
8\( \sqrt{5} \) - 6\( \sqrt{5} \)

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

The factors of a number are all positive integers that divide evenly into the number. The factors of 32 are 1, 2, 4, 8, 16, 32.

To add these fractions, first find the lowest common multiple of their denominators. The first few multiples of 6 are [6, 12, 18, 24, 30, 36, 42, 48, 54, 60] and the first few multiples of 8 are [8, 16, 24, 32, 40, 48, 56, 64, 72, 80]. The first few multiples they share are [24, 48, 72, 96] making 24 the smallest multiple 6 and 8 share.

Next, convert the fractions so each denominator equals the lowest common multiple:

\( \frac{5 x 4}{6 x 4} \) + \( \frac{2 x 3}{8 x 3} \)

\( \frac{20}{24} \) + \( \frac{6}{24} \)

Now, because the fractions share a common denominator, you can add them:

\( \frac{20 + 6}{24} \) = \( \frac{26}{24} \) = 1\(\frac{1}{12}\)

By buying two shirts, Damon will save $33 x \( \frac{15}{100} \) = \( \frac{$33 x 15}{100} \) = \( \frac{$495}{100} \) = $4.95 on the second shirt.