1.2 An integer \( n \) is such that \( 40 \leq n \leq 50 \). Give an example of \( n \) which is a). a prime number b). a multiple of 9 c). a square number

Consider the number pattern below: \[ \frac{-3}{5} ; \frac{-6}{9} ; \frac{-9}{13} ; \ldots . \ldots \] Determine the next two terms of the number pattern. Determine the \( n^{\text {th }} \) term of the number pattern.

5 State which consecutive whole numbers are either side of: \( \begin{array}{llll}\text { a } \sqrt{29} & \text { b } \sqrt{40} \\ \text { e } \sqrt{85} & \text { f } \sqrt{103} & \text { o } & \sqrt{71}\end{array} \)

Calcula las siguientes potencias: \( \begin{array}{ll}\text { a) } 3^{-4}=\frac{\square}{\square} & \text { b) }(3 / 4)^{-2}=\frac{\square}{\square}\end{array} \)

\( \frac{4}{1\times 2}+\frac{4}{2\times 3}+\frac{4}{3\times 4}+...+\frac{4}{23\times 24} \)

The postal service of a country charges \( \$ 0.36 \) postage for a letter weighing up to 1 ounce, plus \( \$ 0.26 \) for each additional ounce up to 5 ounces. Letters weighing more than 5 ounces do not qualify for these rates. \( C(x)=\left\{\begin{array}{ll}\$ \square & \text { if } 0<x \leq 1 \\ \text { (a) Write a piecewise-defined function } C \text { for the postage charged for a letter weighing } x \text { ounces. } \\ \$ \square & \text { if } 3<x \leq 4 \\ \$ \square & \text { if } 4<x \leq 5\end{array}\right. \)