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

A

Step-by-step explanation:

E2020

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)