Question

The nth term can of a geometric sequence?

Answer 1

a1= 1 r= 3

a1= 8 r= 1/2

a1= 4 r= -4

second part of question below

Explanation:

Which of the following is the rule for the geometric sequence 1, 3, 9, 27, . . .?

answer: a(n)= 1 x 3^n-1

Answer 2

1 and 3

8 and 1/2

4 and -4

Explanation:

1 is the first term, and then if you keep multiplying by 3 you get the other numbers.

8 is the first term, and if you keep multiplying by 1/2 you get the other terms.

4 is the first term, and if you keep multiplying by -4 you get the continuing numbers.

Hope this helps!