Rules for writers, Tenth edition - Diana Hacker, Nancy Sommers 2021

Treat most subjects joined with and as plural
Make subjects and verbs agree
Grammar

A subject with two or more parts is said to be compound. If the parts are connected with and, the subject is nearly always plural.

EXCEPTION 1: When the parts of the subject form a single unit or when they refer to the same person or thing, treat the subject as singular.

✵ Fish and chips is always on the menu.

✵ Ali’s friend and adviser was surprised by her decision.

EXCEPTION 2: When a compound subject is preceded by each or every, treat it as singular.

Each tree, shrub, and vine needs to be sprayed.

This exception does not apply when a compound subject is followed by each: Alan and Marcia each have different ideas.