Sia \( f(x)=x^{3}-x \sqrt[3]{2} \). Calcola \( f\left(32^{\frac{1}{3}}\right)-f\left(2^{-\frac{1}{3}}\right) \)

191. Hilda has \( \$ 210 \) worth of \( \$ 10 \) and \( \$ 12 \) stock shares. The numbers of \( \$ 10 \) shares is five more than twice the number of \( \$ 12 \) shares. How many of each does she have?

191. Hilda has \( \$ 210 \) worth of \( \$ 10 \) and \( \$ 12 \) stock shares. The numbers of \( \$ 10 \) shares is five more than twice the number of \( \$ 12 \) shares. How many of each does she have?

Solve the following .... Gramer's rule. \( \begin{array}{c}x+2 y+3 z=6 \\ 2 x+4 y+z=7 \\ 3 x+2 y+9 z=14\end{array} \)

187. Julie went to the post office and bought both \( \$ 0.41 \) stamps and \( \$ 0.26 \) postcards. She spent \( \$ 51.40 \). The number of stamps was 20 more than twice the number of postcards. How many of each did she buy? 188. Jason went to the post office and bought both \( \$ 0.41 \) stamps and \( \$ 0.26 \) postcards and spent \( \$ 10.28 \). The number of stamps was four more than twice the number of postcards. How many of each did he buy? 189. Maria spent \( \$ 12.50 \) at the post office. She bought three times as many \( \$ 0.41 \) stamps as \( \$ 0.02 \) stamps. How many of each did she buy?

समीकरण \( y=2 x \) को \( a x+b y+c=0 \) के रूप में लिखो। Write the equation \( y=2 x \) in the form of \( a x+b y+c=0 \).