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It is a variable
n + 16
6x+4 is the expression that you are looking for.
because writing out all the solutions is not necessarliy a correct answer but a number line is and because graphing out also helps you get a mental image of the concept.
It's the "less than" sign [ < ] above the "equals" sign [ = ].≤When you see it, you read it " ... less than or equal to ... ". That's the same as " ... no more than ... "