Why was Sumerians' use of farming technology essential to the development of cities as
centers of culture and power?

there are no options provided but you can choose among the following gender-neutral pronouns: zir, hir, eir, vis, tem, eir.

in the normal course of maintaining a pronoun-antecedent agreement, we could have used the words his or her but since we are also required to use gender-neutral language, we need to replace it with its equivalent gender-neutral pronoun.

you would times this by how many days there are in a year 365*400=$146000