Eek, so I'm not sure if this is the right forum, but it is technically statistics

Psychology student trying to work out a t-score, but I'm not really good at math, so I'm really struggling with this equation!

please help!!

T = (5.65-511)√(29+77-2)22x77

over

√(29x16.5² + 77x18.57²)(29=77)

I think that's typed out right ):

If someone could help me, I would very grateful!!!!