The profit (in rand) from selling \( x \) products is given by the function \[ P(x)=-0,01 x^{2}+145 x-11000 \] Use the marginal profit function to determine the number of products that have to be sold to maximise the profit.

68. \( 3: 65:: X: 195 \) எனில் X - ன் மத்ப்பு என்ோ? \( \begin{array}{ll}\text { A. } 17 & \text { B. } 3 \\ \text { C. } 9 & \text { D. } 12\end{array} \)

31 A es un digito y sabemos que \( \mathrm{A}+2 \mathrm{~A}+3 \mathrm{~A} \) es un número cuadrado. ¿Cuál digito es A ?

\( \frac{\left(\frac{3}{7} \text { ของ } 35\right)+\frac{2}{3}}{\left(\frac{6}{10} \div \frac{2}{5}\right) \times \frac{8}{12}}=\square \)

\( \sqrt{7+\sqrt{40}}+\sqrt{7-\sqrt{40}} \) \( 2 \sqrt{16} \) ifadesinin eşitini bulunuz.

\( | 1 - \sqrt { 2 } | - | 5 + \sqrt { 2 } | + | - x ^ { 2 } - 2 | - | x ^ { 2 } + 4 | , \quad x \in \Re \)