257. Funksiýalaryň grafigini guruň: \( \begin{array}{ll}\text { a) } y=x^{2}+6 x ; & \text { ç) } y=0,5 x^{2}-4\end{array} \)

Find \( \|\mathbf{v}\| \). \( \mathbf{v}=-3 \mathbf{i}+7 \mathbf{j} \) \( \begin{array}{l}\|\mathbf{v}\|=\square \\ \text { (Simplify your answer. Type an exact answer, using radicals as needed.) }\end{array} \)

Simplify the expression without using a calculator. \( \log _{9} 9=\square \)

20. Vereinfache im Kopf. \( \begin{array}{lll}\text { a) }\left(5^{\frac{4}{5}}\right)^{\frac{5}{2}} & \text { b) }\left(36^{\frac{3}{4}}\right)^{\frac{2}{3}} & \text { c) }\left(49^{-\frac{6}{7}}\right)^{\frac{7}{12}}\end{array} \)

What is the absolute value of \( 2-i \) ? A. 2 B. \( \sqrt{3} \) C. \( \sqrt{5} \) D. \( 2+i \) E. \( -2+i \)

257. Funksiýalaryň grafigini guruň: \( \begin{array}{ll}\text { a) } y=x^{2}+6 x ; & \text { ç) } y=0,5 x^{2}-4\end{array} \)