Variable means subject to change, able to vary or differ.
Example : "In summer, the mountain weather was always variable."
In algebra, a variable is a symbol, usually a letter, that represents one or more unknown or changing number.
Example : "The variable is found using the proper equation."
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Answer 1 == In an open sentence (an equation or inequality with a variable in it), when a number replacing the variable makes the sentence true, then it is a solution.
i am testing a independent variable for my plant it was worth
a variable expression
The variable is x.
You could say, "Today in our science experiment we had to figure out what the dependent variable was"