Math question: What is the volume of a cube with an edge length of 5cm?
+
Math question: Find the 4th derivative of f(x) = 2x^3 - 5x^2 + 4x + 1.
+
Math question: Find all positive integer solutions to the equation a^n + b^n = c^n, where n > 2, a, b, and c are distinct, and none of them is divisible by any prime number > 1.