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. Hello! I'm writing explanations for some problems. I searched these problems on the internet and found wonderful explanations. In my notes regarding a problem I want to give credit for … 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 …

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 …