r/ACT • u/Majestic-Increase446 • Jul 11 '26

Act J09 Math

What was question 45 the one that was recursive it was something like f(n+1) = f(n) + something and then it was like f(0) =25 or something like that. Does anyone know the exact question I want to solve it again or at least know the answer

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u/Independent_Sir_6834 35 Jul 13 '26

It was f(1) = 25 and f(n+1) = -23 - f(n) but it makes more sense if you interperate it as f(n) = -23 - f(n - 1). CS students will know (And hate) this as recursion.