https://imgur.com/lK1xqqU

so (i) is just a parabola. (iv) is a parabola, but only on the right hand side, so where x is a non-negative real number.

How would I graph (ii) and (iii)

For instance, for (ii) the function has a domain of non-negative real numbers, but has a co-domain of all real numbers.

Or (iii) function has a domain of real numbers but codomain of non-negative real numbers.