It means 4 times "m" - in other words, 4 multiplied with whatever value the variable "m" happens to have.
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Well, darling, in algebraic expressions, 4m simply means 4 times m. It's like saying you have 4 apples, but instead of apples, you have m's. So, 4m is just a fancy way of saying "multiply 4 by whatever the heck m stands for."
Algebraic expressions are the written relations of or between variables. For example, x2, 1/x, and x + y + z are all algebraic expressions. Algebraic equations are simply algebraic expressions that equate to something. For example, x2 = 4, 1/x = y, and x + y + z = 42 are all algebraic equations. In general, one differentiates algebraic expressions from exponential, trigonometric, hyperbolic, and logarithmic expressions by requiring algebraic expressions to be confined to polynomial expressions. I've added a link regarding polynomials below.
4m
An expression consists of algebraic terms and has no equality sign
They both use PEMDAS or Order of Operation
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