Nine subtracted from twice a number is [tex]2n - 9[/tex].
In this exercise, you're required to write a mathematical (algebraic) expression for the given word problem or sentence. Thus, we would use a variable to denote the unknown number and write an algebraic expression.
Translating the word problem into an algebraic expression, we have;
- Twice a number = [tex]2[/tex] × [tex]n = 2n[/tex]
Next, we would subtract nine (9) from this value;
[tex]2n - 9[/tex]
Therefore, nine subtracted from twice a number is [tex]2n - 9[/tex].
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