An expression is defined as a set of numbers, variables, and mathematical operations. The correct option is B.
What is an Expression?
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations formed according to rules dependent on the context.
The value of the expression 9+4n-1 when n = 3 is,
9 + 4n - 1
= 9 + 4(3) - 1
= 9 + 12 - 1
= 20
Hence, the correct option is B.
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