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?

can you please explain

Answer 1

do you know the formula?

Answer 2

nopeee

Answer 3

S = a1 (1 - r^n) / (1 - r)

what do you think the a1 and r mean?

Answer 4

a1 is probably the first term.
and then the r is likely the ratio.

Answer 5

good. Do we know what they are?

Answer 6

first term is 6, and the common ratio is -4

Answer 7

plug and chug

Answer 8

and what is n in this case?

Answer 9

i was just about to ask what is n. lol

i have no idea, i guess it would be 7???

Answer 10

its not coming out to any of the multiple choice answers. :(

Answer 11

n = 7

Answer 12

@sourwing

Answer 13

19662 should be the answer if do did the math right

Answer 14

im not sure what i did wrong, but okayy thank you s m