1. **Problem 4(a): Draw a straight line 8 cm long.** This is a practical drawing task. Use a ruler to draw a straight line exactly 8 cm in length. 2. **Problem 4(b): Measure the size of the angle marked $x$.** Use a protractor to measure the angle formed by the two rays. Place the midpoint of the protractor at the vertex of the angle and read the degree measure where the second ray crosses the protractor scale. This gives the value of $x$ in degrees. 3. **Problem 5(a): Calculate $-5 + 8$ using the number line.** Start at $-5$ on the number line. Move 8 units to the right (because adding positive 8). $-5 + 8 = 3$ 4. **Problem 5(b): Calculate $3 - 6 + 2$ using the number line.** Start at $3$. Move 6 units to the left (because subtracting 6): $3 - 6 = -3$. Then move 2 units to the right (adding 2): $-3 + 2 = -1$. Final answer: $-1$. **Summary:** - The line drawn is 8 cm long. - The angle $x$ is measured with a protractor (value depends on the drawing). - $-5 + 8 = 3$ - $3 - 6 + 2 = -1$