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Why is a single number an expression?
An "expression" is anything that can be calculated to get a number, in other words, anything that represents a number, so that includes the numbers themselves.
What is an algebraic substitution?
That means that you replace something, for something else. For example, a variable for a number, or a variable for some other expression.
What is evaluation of an expression?
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.)
What is the meaning of the idiomatic expression nineteen to the dozen?
Nineteen to the dozen is an English expression. It means to do something at breakneck speed, to do something very fast. Example; We hadn't seen each other for years and were were gossiping nineteen to the dozen.
What number has a range of 5a median of 16 and a mean of 15?
A single number cannot have a range (other than 0), nor can it have a median that is different from its mean. A single number cannot have a range (other than 0), nor can it have a median that is different from its mean. A single number cannot have a range (other than 0), nor can it have a median that is different from its mean. A single number cannot have a range (other than 0), nor can it have a median that is different from its mean.
