Hello, first post for me so I am sorry if this is in the wrong topic. I'm am from the UK studying A-Level Physics. I understand some formulas but this is testing me. Before I message my tutor I thought I would try here. Looks like a very useful website. Letters in expressions and formulas. v2 = u2 + 2as I normally understand maths when I know the rules. 2 × 5 is written as 2 × 5 or 10 2 × a is written as 2a a × b is written as ab I don't seem to understand this and I can't seem to find helpful information and I will not skip the page. Sorry if this is in the wrong topic and thank you for your help.