How Do You Calculate the Amplitude of a Standing Wave at a Specific Point?

[Joza]

URGENT. Wave Equation question

I have a standing wave and it's various parameters. I need to work out the amplitude at a point 3 cm to the right of an antinode.

I'm stumped as to how to approach it.

A pointer in the right direction would be great!

 

[hage567]

Can you post the actual question? What's the equation for describing a standing wave?