The expression "You can never change only one thing" refers to the interconnected nature of systems and the ripple effect that changes can have. When you make a change to one element within a system, it often has consequences that impact other parts of the system. This concept is commonly seen in fields such as engineering, Biology, and economics, where changes in one variable can lead to unexpected outcomes in other variables.
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To "simplify an expression" is simply to make it as simple as possible. Ex: 2+2 simplified would be 4. an easy way of thinking about it is removing as many numbers and symbols as possible without changing the expression's meaning. There are also several standards that are universally accepted. Take x*2 for example. this is never seen in an expression this way, but instead as 2x. it is the same thing, but the latter is the accepted version.
Factor out the Greatest Common Factor.
Double verticle lines surrounding an expression means to take the absolute value of the expression. The absolute value of an expression is the expression if it is positive, and the negative of the expression if it is negative, i.e. the unsigned distance from zero. Analytically, in order to process the expression, the absolute value of an expression is also the square root of the square of the expression.
A numerical expression is defined as a combination of numbers and one or more operation symbols. An example is 5 + 7 - 1.
It means an expression that has a verb in it so basically almost all expressions. here's one : "Dipping your big toe in water" dipping is the verb and the whole thing is a phrase and an expression.