A sequence is defined by the formula f of n plus 1 is equal to f of n minus 3 If f of 4 is equal to 22 , what is f of 1 ?

Each time n increases by 1, the sequence value decreases by 3. Working backward from f(4) = 22, add 3 at each step: f(3) = 25, f(2) = 28, and f(1) = 31. The correct choice is D, 31.

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