3. \( \left(\frac{x}{a^{2}+a x}-\frac{2}{a+x}+\frac{a}{x^{2}+a x}\right)=\left(\frac{x}{a}-2+\frac{a}{x}\right) ; \)

1.3 \( a \times a \times a \times a \) canbe expressed as. (a) \( 4 \times a \) (b) \( 4^{a} \) (c) \( 9 / 4 \) (d) \( a^{4} \) 14 The HCF of 40 and 60 . (a) 10 (b) 5 (c) 20 (d) 12

7. \( 2 x^{2}+x-4=0 \) \( \begin{array}{ll}\text { a. }-\frac{1}{2} \pm \frac{\sqrt{33}}{4} & \text { c. }-\frac{1}{4} \pm \frac{\sqrt{33}}{4} \\ \text { b. }-4 \pm \frac{\sqrt{66}}{4} & \text { d. }-\frac{1}{2} \pm \frac{\sqrt{33}}{2}\end{array} \)

Solve the inequality. Express the solution set in set-builder notation and interval notation. Graph the solution set on a real number line. \( \frac{1}{2}(n-4)>n+5 \)

в) \( x+15 \frac{3}{17}=20 \frac{14}{17} \) \( x= \) \( x= \) \( x= \)

d) \( 16 \cdot 4^{15}:\left(8^{2} \cdot 4^{5}\right)=8^{x} \)