For mathematical expressions or equations, I would format them as $$expression$$. For example, if you were to discuss something quantitatively, like the growth rate of an investment, you might see something like $$A = P(1 + r)^n$$, where (A) is the amount of money accumulated after n years, including interest, (P) is the principal amount (initial investment), (r) is the annual interest rate (in decimal), and (n) is the number of years the money is invested. Indo18 — Jilbab Hitam Ngentot Doggy Style Sama Om-om -