I'm trying to broaden up my vocabulary and try to make my It sound more professional. What steps should I take to achieve this? Please help me.

Well, looking for synonyms to words can help, try reading some more. Believe it or not, reading broadens your vocabulary. Just a few suggestions hope it's helpful :)

Explanation:

hi! my name is angelica! i'll be assisting you today. i believe that the missing word is "questions" hope i !

we know that, volume of a rectangular prism is given by :

✿   {length × width × height}

given : the length of rectangular prism = 5.5

given : the width of rectangular prism = 6

given : the height of rectangular prism = 3

⇒ the volume of given rectangular prism = {5.5 × 6 × 3}

⇒ the volume of given rectangular prism = 99