There is only one extra rule to algebraic expressions over normal numerical expressions: when two letters are next to each other it means multiply them together:
ab means a times b
The multiplication symbol is omitted as it looks too much like the letter 'x' can could be confused as such.
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What is the Army writing standard
nope
Another way of writing 3.78x105 is 396.9.
You could say "writing utensil" or "writing instrument." Or for a verb, "sketch" or something.
A quadrillion.