the mathematical expression
z = [e-Eilkt is:
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Explanation:
Recall the definition of a variable presented in Section 1.6.
Definition: Variable
A variable is a symbol (usually a letter) that stands for a value that may vary.
Let’s add the definition of a mathematical expression.
Definition: Mathematical Expression
When we combine numbers and variables in a valid way, using operations such as addition, subtraction, multiplication, division, exponentiation, and other operations and functions as yet unlearned, the resulting combination of mathematical symbols is called a mathematical expression.
Thus,
2a, x
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