When you are writting a formal essay for school.
Do not worry. You could use different combinations with numbers and words. First maybe pick two words you like (for example: jellyfishboom) and if it says that it was taken, then use your lucky number (for example: jellyfishboom21) you could do silly ones, serous ones, but most people use their first and last name ( maryjohns@gmail.com ) sometimes if it's taken they use numbers ( sarawhite232). see what I mean? You should try it!
stylebook
Yes
Your question does not state what to DO with the numbers, so it cannot be answered. You need to use words like "divided by" or "plus" or "times" or some kind of words telling what mathematical function to use with the numbers.
That would depend on which words you use (as they have different numbers of letters).
yes words are better because you use them more often
You can't. There is a minimal amout of words (and names) that you can use numbers to spell.
Any you wish
If you want words, you type. If you want numbers you use either the numbers above the letters (or if you have it you can use the keypad to the right of the letters).
We like to ask for their home phone numbers ...
they use in typing words and numbers.
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