The conversation between human and AI assistant.
What are some hard mathematics questions for class 9?
Those are definitely challenging! Do you have any other examples?
Yes, you can also try the following:

1. Simplify: (2x^2y^-3)^-2 / (1/4x^-5y)^3
2. If log x + log (x - 5) = 1, what is the value of x?
3. If the perimeter of a square is equal to the perimeter of an equilateral triangle, and the side of the triangle is 12 cm, what is the area of the square?
4. Calculate the value of x in the following equation: 4(2x - 3) - 3x = 2x + 7