Answer:
Subtract -3
Explanation:
4--3 is 1, 1--3 is -2, -2- -3 is -5, when subtracting negatives they add together to from a bigger negative.
7-3n
the difference between 4, 1 is 1 -4= -3
the difference between 1, -2 is-2-1=-3
The formula is a + (n-1)d => 4 + (n-1)-3
=> 4 -3n +3
=> 7-3n
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