An explanation of the Jerry Houser influence on Hollywood

Hi, In the following sentence, should I use "explanation" or "explanations"? Sentence1: I needed to tailor explanation(s) to each student. Sentence2: I commented on whether the explanations … Hola a tod@s, hace poco me explicaron que la palabra "explanation" puede ir acompañada de, entre otras, las preposiciones "on" o "of". El contexto en el que estaba la palabra era … To me "explanation why" seems like an abbreviated version of "explanation as to why", but I would like to know if either is more correct, or both are incorrect in the strictest sense.

These two sentences are from the Cambridge Online dictionary: Could you give me a quick explanation of how it works? What was her explanation for why she was late? I am not quite … What written phrases could you use to clarify meanings in your actual academic writing, e.g. in explanations similar to those you gave in answer to the questions above? Use these key words to help … I have always seen this phrase used in passive voice, so I wonder if it can be changed into active voice, and of course in same meaning, since the explanation says 'it was made by God or fate', … [Grammar] - Which is correct? Explanation why vs explanation as to …