\( \begin{array}{ll}\text { Calculate } \sum_{i=1}^{10} 1 & \text { (b) Calculate } \sum_{i=1}^{50} 1 \\ \text { Hence show that } \sum_{i=1}^{n} 1=n & \text { (An important result to remem) }\end{array} \)

S. Dari pola bifangan berikut: \( 5,11,19,30,45,65, x, y, 2 \). Nilai \( x, y \) dan \( z \) adalah \( \begin{array}{llll}\text { A. } 91,123,165 & \text { B. } 91,124,165 & \text { C. } 91,124,166 & \text { D. } 91,125\end{array} \)

Identify the missing number: \( 24 \div 4=\ldots \div 6 \)

Which number is a reasonable estimate for 1,519/ 49 ? 10 30 100 300

The domain of \( f(x)=\left\{\begin{array}{ll}\sqrt{x-5} & , x>3 \\ \frac{1}{x+5} & , x<0\end{array}\right. \) is:

ய. \( \frac{2}{3} \sqrt[3]{81}-\frac{1}{2} \sqrt[3]{24}+\frac{2 \sqrt[3]{135}}{3}-\frac{3 \sqrt[3]{40}}{2} \)