5.. Tentukan \( \left(a^{-7}\right)^{4} \) adalah ... a. \( \mathrm{a}^{11} \) c. \( \mathrm{a}^{-3} \) b. \( \mathrm{a}^{-11} \) d. \( \mathrm{a}^{-28} \)

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

2) Eduardo ran 26 kilometers less than Jennifer last week. Eduardo ran 18 kilometers. How many kilometers did Jennifer run?

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

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...

\( x \div 8 = 3 ; x = \)