Question

Need help with one and two

Answer 1

Answer:

(1) is a function, surjective aka onto,

not bijective aka one to one.

domain is {3,6,12,14,20,22},

range is {4,15,8,11}. More elements in domain means it can't possibly be one to one.

(2) is a relation but not a function, although its inverse is a function. There are fewer elements in the domain than the range, so a function could not be onto but would have to be into or injective.

The relation you get by restricting the domain to {1,19} is a function, injective, so that the image of the domain is a proper subset of the range.