TEX document #9

M \overline{x} = ∑_{i} m_{i}x_{i} or ∫∫∫ ρ x dV or ∫∫ ρ x dA

I_{z} = ∫∫∫ ρ (x^{2} + y^{2}) dV, etc.

∫_{a}^{b} x^{n} f(x) dx, n = 0, 1, 2, 3, …,