Which of the following diagram represents a relation that is NOT a function?

The answer to your question is A) the first mapping. A function is a relation in which each and every element of X i.e. domain has a unique image in Y i.e. co-domain, because in the first mapping, element 2 is mapped to -3 and 5.

answer; /// i believe the correct answer is (achilles tendon)(c)

for me i have felt invisible when i was clearly struggling,or,i made a great achievement ,and,nobody took to notice me either because they just didn't see it,or,people just turned their back on me.i can see a person being invisible by choice,or,without choice like i did.the people who are invisible by choice don't try to talk to people,don't try to make friends,and,keep to themselves.i haven't been one of those people so i couldn't give you a reason.

hope this and can i get bainliest my dude : d