Question

What is the sum of a 7-term geometric series if the first term is 6, the last term is 24,576, and the common ratio is -4? (1 points)

-32,766

-19,662

19,662

32,766

Answer 1

What ?

Answer 2

I didn't think you were given the common ratio, I didn't finish reading, and I would never think that they would give it to you, since you didn't need it.

Answer 3

Oh Okay

Answer 4

\(\LARGE\color{teal}{ \rm S_n=\frac{a_1(1-r^n)}{1-r} }\)

Answer 5

So I Plug it in

Answer 6

That I Don't Understand How , But I Know How To Solve It

Answer 7

a1 is the first term, r is the ratio, n is the number of terms.

Answer 8

so what is \[r ^{n}\]

Answer 9

I really can't be explaining how the recursive formula works and what each thing stands for right now. I am sorry -:(

Answer 10

k

Answer 11

Thanks btw

Answer 12

anytime