another way to phrase this question is: what does f(3) = ?

can you answer now?

if g:A -> B is a function. the domain is A and the codomain is Bb) what is the codonmain of f

you should look up the definitions of "domain" and "codomain"

what's a "disgraph"?c)draw the disgraph representing f

injective means one to one.d) is the funcation injective or subjectiv enad why

one to one means. If f(a) = f(b), then a = b, for all elements in the domain. So basically, if two images are the same, then the number in the domain that maps to them must be the same.

Hint: find two images that are the same, do they come from the same thing?

surjective means onto. this means that EVERY element in the codomain is mapped to, that is, every element in the codomain is the image of some element in the domain