4. 28 คิดเป็น \( 40 \% \) ของจำนวนใด

9) \( \frac{x^{2}+7 x+6}{x+1} \div \frac{10 x+60}{x+1} \) \( \begin{array}{ll}\text { A) } x-5 & \text { *B) } \frac{x+1}{10} \\ \text { C) } \frac{10 x}{x+9} & \text { D) } x-1\end{array} \)

Question simplify: \( \sqrt[5]{\frac{u^{13}}{u^{5}}} \)

Diketahui fungsi \( \mathrm{f}(\mathrm{x})=\mathrm{x}^{2}+\mathrm{x} \) dan \( \mathrm{g}(\mathrm{x})=\frac{2}{\mathrm{x}+3} \) maka (f.g) adalah...

Question simplify: \( \sqrt[3]{\frac{625 u^{5}}{y^{12}}} \)

True or false \( 4: 3 x=32: 72 \) if \( x=3 \)