Help a newbie..?

#1
I am trying to learn to write scripts. Please advise how to:

1) Convert an answer to a positive number, so that, for example, when I am taking the difference between an open and a high, but I only want it to be a positive, and if it is negative, I will need to convert it.

2) Indicate that I want to take the largest of three numbers (T1, T2 and T3).

Thank you very much.
 

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