Hi, can someone pls help me? I really don’t understand this

Function is an assignation that for each element of first set assigns one and only one element from second set.

1) NO    {element 2 from set one has assigned two elements (b, c) from set two}

2)  YES

3) YES     {several elements from set one can have assigned the same element from set two}

4), 5)   YES

6)  NO   {for x from about -4 to about 0.5 there are two y}

answer: approximately 206 bones

i hope this u out a branlist and a would be greatly appreciated :