So many Internet sources say different things.<br/><br/>Which are the correct verb choices below?<br/><br/>1. One and one equal/equals two.<br/>2. One and one is/are two.<br/><br/>3. One plus one is/are two.<br/>4. One plus one equal/equals two.<br/><br/>5. Two plus two equal/equals two.<br/>6. Two and two is/are four.<br/><br/>Thank you.