Evaluate \(\left(\frac{81}{16}\right)^{\frac{-1}{4}}\times 2^{-1}\)

Simplify (\(\frac{3}{4}\) of \(\frac{4}{9}\) \(\div\) 9\(\frac{1}{2}\)) \(\div\) 1\(\frac{5}{19}\)

Correct 241.34(3 x 10-\(^3\))\(^2\) to 4 significant figures

Factorize completely 81a\(^4\) - 16b\(^4\)

Find the value of (4\(^{\frac{1}{2}}\))\(^6\)