The least common multiple (LCM) is the smallest positive integer that is a multiple of two or more integers.

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

7\( \sqrt{20} \) - 3\( \sqrt{5} \)
7\( \sqrt{4 \times 5} \) - 3\( \sqrt{5} \)
7\( \sqrt{2^2 \times 5} \) - 3\( \sqrt{5} \)
(7)(2)\( \sqrt{5} \) - 3\( \sqrt{5} \)
14\( \sqrt{5} \) - 3\( \sqrt{5} \)

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

If the tiger has consumed 98 pounds of food in 7 days that's \( \frac{98}{7} \) = 14 pounds of food per day. The tiger needs to consume 154 - 98 = 56 more pounds of food to reach 154 pounds total. At 14 pounds of food per day that's \( \frac{56}{14} \) = 4 more days.

A factorial has the form n! and is the product of the integer (n) and all the positive integers below it. For example, 5! = 5 x 4 x 3 x 2 x 1 = 120.

By buying two shirts, Frank will save $50 x \( \frac{45}{100} \) = \( \frac{$50 x 45}{100} \) = \( \frac{$2250}{100} \) = $22.50 on the second shirt.

So, his total cost will be
$50.00 + ($50.00 - $22.50)
$50.00 + $27.50
$77.50