15. \( \begin{aligned} 5 r-5 s+4 t & =15 \\ 3 r+5 s-6 t & =7 \\ -r+5 s-5 t & =20\end{aligned} \)

В ар иант 2 1. Преобразуйте в многочлен. а) \( (x-6)^{2} ; \)

Enter the correct answer in the box. Rewrite the expression \( 2 \sqrt[4]{x^{7}} \) using rational exponents. \( \begin{array}{lll}\frac{\square}{\square} & \text { (ㅁ) } \mid \text { 미 } \square^{\square} \mid+--\end{array} \)

What is the solution to the equation? \( \sqrt[3]{2 x+5}=5 \) A. 240 B. 65 ( \( ) 60 \) D. 6 D. 5

5. \( \left(16 x^{2}\right)^{-1} \)

Encuentra el resultado utilizando la propiedad de potencias: \( (a^{2b})^{3} \)