1. Solve for $x$: $$2x + 5 = 15$$ 2. Simplify: $$3(2x - 4) + 5x$$ 3. Factorize: $$x^2 - 9$$ 4. Solve the quadratic equation: $$x^2 - 4x - 5 = 0$$ 5. Find the gradient of the line passing through points $(1,2)$ and $(4,8)$. 6. Calculate the value of $y$ when $x=3$ in the equation $$y = 2x^2 - 5x + 1$$. 7. Expand and simplify: $$(x + 3)(x - 2)$$ 8. Solve for $y$: $$3y - 7 = 2y + 5$$ 9. Find the midpoint of the line segment joining points $(2,3)$ and $(6,7)$. 10. Express $$\frac{3x}{4} + \frac{5x}{6}$$ as a single fraction in simplest form.