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I have this unit problem.. Plz help.
You haven't defined superscript n.
PS It's usually best to upload your worksheet, not just an image.
The units in your first equation don't balance, neither if we assume n=2, nor for any other value of n.
The left hand side is of dimension "length", the right hand side pressure^n * length^(n/2)
Fatigue crack growth using Paris' parameter can be a bit of a challenge. See if the attached can give you a place to start from.