Question

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What are the explicit equation and domain for an arithmetic sequence with a first term of 8 and a second term of 5?

Answer 1

A. an=8-5(n-1) ; all integers where n is greater than or equal to 1

B. an= 8-5(n-1) ; all integers where n is greater than or equal to 0

C. an=8-3(n-1) ; all integers where n is greater than or equal to 1

D. an=8-3(n-1) ; all integers where n is greater than or equal to 0

Answer 2

Also this one

What is the sum of the geometric sequence -3, 18, -108 if there are 8 terms?
A. 719,835
B. 119,973
C. -119,973
D. -719,835