Subjects joined by the word ''and'' are usually considered to be plural subjects that require the plural verb form. Subjects joined by the word ''and'' are denominated compound subjects. Nevertheless, compound subjects can be divided by words like ''or'' and ''nor as well.'' Each of these words has different rules about subject/verb agreement.
The rule about subjects joined by 'and' is that there must be a subject-verb agreement. This means that if the subject is singular, then the verb must be also singular. On the other hand, if the subject is plural that means the verb must also be plural.
