1. Solve the simultaneous equations: $$\begin{cases} 2x + 3y = 12 \\ x - y = 3 \end{cases}$$ 2. Simplify the algebraic fraction: $$\frac{3x^2 - 12}{6x}$$ 3. Find the sum of interior angles of a polygon with 8 sides. 4. Simplify the surd: $$\sqrt{50} + \sqrt{18}$$ 5. Calculate the area of a rectangle with length 7 cm and width 5 cm. 6. Find the perimeter of a triangle with sides 6 cm, 8 cm, and 10 cm. 7. Calculate the volume of a cube with side length 4 cm. Each question covers a key topic from the grade 8 syllabus relevant to Maldives.