1. Solve for $x$: $$2x + 3 = 11$$ 2. Factor the quadratic expression: $$x^2 - 5x + 6$$ 3. Find the derivative of the function: $$f(x) = 3x^3 - 4x + 7$$ 4. Calculate the integral: $$\int (2x + 1) \, dx$$ 5. Solve the system of equations: $$\begin{cases} 2x + y = 5 \\ x - y = 1 \end{cases}$$ These problems cover basic algebra, calculus, and systems of equations for practice.