I absolutely suck at physics. Here is the question I'm stuck on: The masses and coordinates of four particles are as follows: 69 g, x = 2.0 cm, y = 2.0 cm; 38 g, x = 0, y = 4.0 cm; 21 g, x = -3.0 cm, y = -3.0 cm; 24 g, x = -2.0 cm, y = 4.0 cm. What are the rotational inertias of this collection about the (a) x, (b) y, and (c) z axes? Any help would be appreciated!!!