Spanish language Q&A Forum

In the kwiz, the sentence is: "La matemática y la aritmética no son lo mismo." I understand that we use "lo mismo" when discussing an abstract idea, but in this case, does the phrase have to match the compound subject and verb, los mismos? 

I think playa is a feminine noun. No?

I have become accustomed to value judgements taking the subjunctive. The best thing about this date was...

Is the subjunctive also possible in the next clause?

Thanks!