Question

An arithmetic sequence is represented by the recursive formula below.

a1 = 18
an = an - 1 - 9
What is the seventh term in the sequence?
a7 = -27
a7 = -36
a7 = -9
a7 = -45

Answer 1

B. a7=-36

Step-by-step explanation:

Follow the pattern of subtracting nine, and you will find the seventh term which I gave above.

Answer 2

Answer: -36

Step-by-step explanation:

an = a1 + f × (n-1)

an = 18 - 9 × (n-1)

a7 = 18 - 9 × (7-1)

a7 = 18 - 9 × (6)

a7 = 18 - 54

a7 = -36