Final answer:
Maria has already invited 5 friends to her party. To determine how many friends Maria has already invited to her party,
Step-by-step explanation:
To determine how many friends Maria has already invited to her party, we need to subtract the number of remaining invitations from the total number of invitations. Maria has 12 more invitations to send and the total number of invitations is 17. Thus, the number of friends she has already invited can be found by subtracting 12 from 17:
17 - 12 = 5
Therefore, Maria has already invited 5 friends to her party.