Can anyone help me with this question attached I cant figure it out!

 

hi Bob,
Welcome to AAC.
As this is homework please post your best attempt at answering, we can then help you.
E

 

Try to come up with a better thread title than "Help with question", perhaps "Help with delta-star conversion".

The following article might help you: https://www.allaboutcircuits.com/technical-articles/delta-wye-transforms-behind-the-scenes/

For use to provide any further assistance, you need to show your best effort to work your homework as far as you can.

 

I've only got as far as know these equations

But when adding the complex numbers in it kind of makes me lose track to be honest.

 

You just treat them like any other resistance (impedance, in this case).

Do you know how to add, multiply, and divide complex numbers?