"Like chalk and cheese" is a common, and pretty obvious one (you couldn't really substitute one for the other)..really means "not alike" rather than opposite.
"Poles apart" is another, as in "the two footballers are poles apart in terms of fitness"...it comes from the North & South poles at opposite ends of the earth.
It means to do the required calculations, in order to get a single number as a result. (Or some other data type, which is not numeric - in computer science, date expressions and text expressions are also used, among other things.)
An equation.
In many ways. It really depends on the algebraic expression. If several terms are added/subtracted, you can usually combine similar terms (terms that have the same combination of variables). If variables are multiplied, you can combine the same variable, adding the corresponding exponents. Sometimes expressions get simpler if you factor them; sometimes you have to multiply out (in other words, the opposite of factoring). Quite frequently, you have to use a combination of methods to simplify expressions. Take an algebra book, and look at some of the examples.
Two expressions that equal each other is an equation
It is formed by two expressions that equal each other
Idiomatic expressions are essentially literary and not pictorial. There are some well illustrated, pictorial books titled " English Idioms [ in Business, in Sports, in Relationships, etc. ] or something similar, in bookstores at home and abroad. Try your local library or other book supplier.
Idioms are phrases that cannot be understood without learning them - in other words, if you don't know them, you won't understand what the person is actually saying.
there really is no such other word, but when a person is "obese" or overweight, you can be sure they are well aware of it, and do not have to be reminded by an unthinking person This will only cause sadness.
Best idiomatic expression for unemployment is "on the dole" There are other expressions like "out of work" or "not in job" but they are not as impressive as the first one.
"Por" is one of those words that can take on several meanings depending on context. It can mean "for", "by", "through", "via", or others when used in combination with other words in idiomatic expressions.
its playins things that arn't normaly together in key with alot os other stuff that is unique to yourself
It means to do the required calculations, in order to get a single number as a result. (Or some other data type, which is not numeric - in computer science, date expressions and text expressions are also used, among other things.)
Yes. Other things about parallelograms: -opposite sides are equal in length. -opposite angles are equal in length. -diagonals bisect each other.
Opposite charges attract, and similar charges repel.
reckless, careless, clumsy, and probley some other things
I think you mean "Get OUT OF my face." I don't know of a meaning of "get off my face" other than the literal one. "Get out of my face" means to back off and stop antagonizing me. The image is of someone pushing their face right up next to yours and shouting at you.
Absolutely. But the slang back then was quite different from the slang today. Throughout history, there has always been slang, as well as various metaphors and similes and other idiomatic expressions. You will even see in many of Shakespeare's plays that he uses puns, idioms, and slang.