how to solve this questions?

Suppose that the production function for a commodity is given by Q - 10VLK where Q is the quantity of output, L is the quantity of labor, and K is the quantity of capital. Indicate whether this production function exhibits constant increasing, or decreasing returns to scale. [2 marks] Does the production function exhibit diminishing returns? If so, when does the law of diminishing returns begin to operate? Could we ever get negative returns? [5 marks]