Rationalize each denominator. See Example 8. 4 —— √6

Rationalize each denominator. See Example 8. 18 —— √27

Rationalize each denominator. See Example 8. 12 —— √72

Rationalize each denominator. See Example 8. 3 ———— 4 + √5

Rationalize each denominator. See Example 8. (√3 + 1)/(1 - √3)

Rationalize each denominator. See Example 8. (√2 - √3)/(√6 - √5)

Simplify. See Example 9. (-√2/3)/(√7/3)

Simplify. See Example 9. (√7/5)/(√3/10)