Question

What is the explict formula for the arithmetic sequence -7.5,-9,-10.5,-12

Answer 1

Answer:

x = -7.5 - 1.5(n−1)

Step-by-step explanation:

the explicit formula for the arithmetic sequence has the form

x = a + d(n−1)

a is the first term and d is the common difference

The given arithmetic sequence is

-7.5,-9,-10.5,-12

The first term is -7.5

d = common difference = -9 - (-7.5) = -1.5

∴ x = -7.5 - 1.5(n−1)