MEDAL!!!!

The first four terms of a sequence are shown below.
8, 5, 2, -1

Which of the following functions best defines this sequence?

f(1) = 8, f(n + 1) = f(n) + 3; for n ≥ 1
f(1) = 8, f(n + 1) = f(n) - 5; for n ≥ 1
f(1) = 8, f(n + 1) = f(n) + 5; for n ≥ 1
f(1) = 8, f(n + 1) = f(n) - 3; for n ≥ 1

Question

MEDAL!!!!

The first four terms of a sequence are shown below.
8, 5, 2, -1

Which of the following functions best defines this sequence?

f(1) = 8, f(n + 1) = f(n) + 3; for n ≥ 1
	f(1) = 8, f(n + 1) = f(n) - 5; for n ≥ 1
	f(1) = 8, f(n + 1) = f(n) + 5; for n ≥ 1
	f(1) = 8, f(n + 1) = f(n) - 3; for n ≥ 1

anonymous · Answer

From 8 to 5, you subtract 3. From 5 to 2 you subtract 3. From 2 to -1, you also subtract 3. So your answer is D since you subtract 3 from each term in the sequence.