This is the 11285th most frequent Spanish word.
equivocadas
"Equivocadas" means "wrong" or "mistaken."
Here 'equivocadas' is used as an adjective describing 'decisiones' meaning 'wrong' or 'incorrect' in the context of choices.
Las decisiones equivocadas pueden llevar a consecuencias inesperadas.
Wrong decisions can lead to unexpected consequences.
In this case, 'equivocadas' denotes the state of being wrong or mistaken, describing a group of females ('ellas' implied) as being incorrect in their assumption.
Estaban equivocadas al pensar que la tienda estaría abierta a medianoche.
They were wrong to think the store would be open at midnight.
Here, 'equivocadas' serves to indicate that 'notas' (notes) contain inaccuracies or mistakes.