Income tax on scholarships - calculation on 1040?

as a parent of a student with a ‘full ride’, I understand the tax treatment of the R&B part. Just want to check though if I can also withdraw 529 $ for that same R&B expense (in same year as it was paid) since in essence it was paid with ‘taxable income’?

^Yes See https://www.irs.gov/publications/p970/ch08.html