Ok, ive got this all mixed up

 

If I have 5 concentrations of a substance (IAA) 10-4, 10-3, 10-2, 10-1 and 1, can you please list them from highest to lowest concentration (urgent reply needed). Trust me you will only be steering me in the right direction, this isnt all my homework, I have to write a whole prac report by tomorrow.

it's not very clear what numbers you're trying to ask about, or the unit of those numbers...

is it this?

[math]10^4, 10^3, 10^2, 10^1 [/math] and [math] 1[/math]

or is it this?

[math]10^{-4}, 10^{-3}, 10^{-2}, 10^{-1} [/math] and [math] 1[/math]

 

also, you may want to do some research on exponents... this is a pretty simple question in terms of mathematics.