Rationalize the denominator. $\(\frac{11}{\sqrt{7}\) - \(\sqrt{3}\)}$

Simplify each expression. Write answers without negative exponents. Assume all variables represent nonzero real numbers. y⁸/y¹²

Simplify each expression. Write answers without negative exponents. Assume all variables represent nonzero real numbers. 6⁴/6^-2

Use the rules for radicals to perform the indicated operations. Assume all variable expressions represent positive real numbers. √14 • √3pqr

Evaluate each expression in Exercises 55–66, or indicate that the root is not a real number. ³√8