3) \( 6 \log _{2} \frac{2}{3}+2 \log _{2} \frac{1}{6}-4 \log _{2} \frac{2}{9} \)

A) \( a^{2}-25=(a-5)(a+5) \)

9. Meled the subject of the relation \( \mathrm{w}=\mathrm{M} \sqrt{\frac{\left(\mathrm{D}^{2}+\mathrm{d}^{2}\right)}{2 \mathrm{~d}^{2}}} \) Find d when \( \mathrm{D}=3.6, \mathrm{M}=3 \) and \( \mathrm{w}=2.4 \) giving your answer correct to three significant figures.

A factor of \( x^{3}-1 \) is \( \begin{array}{ll}\text { (a) } x-1 & \text { (b) } x+1 \\ \text { (c) } x^{2}+x+1 & \text { (d) Both (a) \& (c) }\end{array} \)

II. \( (3+c)^{2} \)

Solve the equation: \( \sqrt[4]{x} + 5 = 7 \)