Question

Write an explicit formula for a
n, the nth term of the sequence 17, 15, 13

Answer 1

t(n) = 19 - 2n

Explanation:

Using the formula t(n) = a + (n-1)d

a = first term

n = nth term

d = common difference

t(n) = 17 + (n-1)(-2)

t(n) = 17 + (-2n + 2)

t(n) = 19 - 2n