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.
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.
x-5
In algebraic expressions, it is acceptable to omit the coefficient of 1 when it is in front of a variable. For example, instead of writing (1x), you can simply write (x). This convention helps simplify expressions and makes them easier to read. Additionally, in multiplication, expressions like (1 \cdot x) are often written as just (x).
Sets are not determined by algebraic expressions: they are simply collections of elements. The only requirement is that given any element, it is possible to decide whether or not it belongs to the set.The following, for example, is a set: {yellow, 7.9, April, moon, happy, squirrel}. It is a set of six things (words) I though of while writing this answer. No algebraic expressions will explain the meaning of that set.
she could tell her feelings and expressions by writing them down and then she begins to like writing stories
The answer depends on the expression.
informal
You'll know young warrior.
No, contractions and colloquial expressions are not acceptable in business language. You should keep your language professional and focus on the message of the writing.
A writing style that incorporates expressions common to only a small group of the population is known as a "jargon" or "slang" style of writing. This type of writing is often used within specific communities or professions to communicate more effectively among members who share a specialized vocabulary or set of terms.
avoid using the same ones over and over as it can be boring
In fiction, it is OK to use colloquial expressions and slang so long as you keep it to a minimum. The best way to write a novel is to use proper grammar, and save the slang for the dialogue of the characters.
A polite address is a way of writing or talking to someone, in which you would use a prefixed title. Such as saying Dr. Whoever, or Mrs. Smith, it is the polite way to address someone.