Answer: The required expression is [tex]n-3.[/tex]
Step-by-step explanation: We are given to write an expression for the following statement :
"n decreased by 3."
We know that
if we are decreasing a units from some quantity b, then we should subtract a from b.
This is written as follows :
[tex]E=b-a.[/tex]
Therefore, for the given expression, we should subtract 3 from n.
This can be written as :
[tex]E=n-3.[/tex]
Thus, the required expression is [tex]n-3.[/tex]
