An argument is invalid if and only if all the premises is true and the conclusion is false.
We can test the invalidity of the argument by assuming all the premises are true and seeing whether it is possible for the conclusion to be false. If the conclusion is possible to be false, then, the argument is invalid.
A valid argument, on the other hand, is valid if and only if it is necessary that:
1) if all of the premises are true, then the conclusion is true
2) if all of the premises are true, then the conclusion must be true
3) it is impossible that all the premises are true and the conclusion is false.
The answer is D. This strip mall will not only help me, ladies and gentlemen, but help all other struggling businesses in this difficult economy.
It is a good argument because it goes beyond his personal gain and uses a current problematic to convinve the listeners.
Because of their cultural and economical differences.
The answer is the first option: We live on the same street.
The nominative case takes subject pronouns only, since the pronouns are the subjects of the sentences. They are: I, you, he, she, it, we, you, they.
Options b, c and d have object pronouns - them, me and him - acting as subject pronouns and, consequently, as subjects to the verbs, making the sentences grammatically wrong.
