1. State whether the following mappings are one-to-one, many-to-one, one-to-many or many-to-many.

(i) $f:x↦{x}^{2}$

(ii) $f:x↦3x+1$

(iii) $f:x↦(x+1{)}^{3}$

(iv) $f:x↦\pm\sqrt{x}$