Answer:
In the expression
[tex]2x + 5[/tex]
[tex]x \: \: \: \: is \: the \: variable[/tex]
[tex]2x \: \: \: \: is \: the \: leading \: term[/tex]
[tex]5 \: \: \: \: is \: the \: constant \: ter[/tex]
The "variable" in an expression should be a letter ( x and y is an example )
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