1.4 On November \( 21^{\text {st }} \) at Rundu the sun rises at \( 04: 39 \). The sun set 17 hours 36 minutes later. Write down the time when the sun set. [3] The length of a stick is given correct to 3 significant figures as 2.63 m . Find the lower and upper bounds. [Total: \( \mathbf{2 5} \) Marks]

Ejercicio 2: Cinco carpinteros necesitan 21 días para entarimar un suelo. ¿Cuántos carpinteros seran necesarios si se desea hacer el trabajo en 15 dias?

11. If the average (arithmetic mean) of five numbers is 4 and if four of the numbers are \( 1,3,5 \), and 7 , what is the fifth number? \( \begin{array}{llll}\text { (A) }-1 & \text { (B) } 0 & \text { (C) } & \text { (D) } 6\end{array} \) (E) 9 \( \$ \begin{array}{l}\text { (D) }\end{array} \)

Ex. 3 Simplify \( \left(9.6 \times 3.6 \div 7.2+10.8\right. \) of \( \left.\frac{1}{18}-\frac{1}{10}\right) \)

What is 100 degrees Celsius equal to in Fahrenheit?

Aşağıdaki sayıların 3 ile bölünebilmesi için gelebilecek rakamların tamamını yazınız. 1. \( 12 \square 8 \rightarrow \) 2. \( 150 \square \rightarrow \ldots \) 3. \( 11 \square 02 \rightarrow \)