Write an explicit formula for the sequence 8, 6, 4, 2, 0, ... Then find a14.

Question

1.an = –2n + 10; –16
2.an = –2n + 8; –18
3.an = –2n + 8; –20
4.an = –2n + 10; –18

Answer 1

The correct answer is 3. an = –2n + 8; –20

The explicit formula for the sequence is an = -2n + 10.

a14 = -2(14) + 10
a14 = -28 + 10
a14 = -18

Therefore, the correct answer is 3. an = –2n + 8; –20.