It's Friday, which means...

## It's free for all Friday time!

Any questions you've got, about maths or anything else, pop them in the comments. I'm in the middle of the deadline doldrums (the next Dummies book won't write itself, you know!) but I'll pop in once in a while to answer when I need a break. That's what Free for all Friday is all about!

Edited 2014-09-21 to fix link.

## Colin

Colin is a Weymouth maths tutor, author of several Maths For Dummies books and A-level maths guides. He started Flying Colours Maths in 2008.
He lives with an espresso pot and nothing to prove.