This is the 6848th most frequent Polish word.
francuskiemu
"Francuskiemu" means "to the French" or "French" in the dative case.
In this sentence, 'francuskiemu' is in the dative case, modifying 'studentowi' (student), indicating the person receiving help.
Pomogliśmy francuskiemu studentowi w nauce języka polskiego.
We helped the French student with learning the Polish language.
Here, 'francuskiemu' is also in the dative case, modifying 'przyjacielowi' (friend), showing the object of interaction.
Odpowiedziałem francuskiemu przyjacielowi na jego pytania.
I answered the French friend to his questions.
'Francuskiemu' in this sentence describes the seller ('sprzedawcy') in dative case, marking the individual whose trust is earned.