What is 4x in math?

Excuse me, could you please clarify what you mean by "4x in math"? Are you referring to the multiplication of the number 4 by some variable x, which is a common algebraic expression? Or perhaps you're asking about a specific concept or application of 4x in a mathematical context that I'm not aware of? Without more context, it's difficult to give a precise answer, but hopefully this helps to start the conversation.