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?

Answer 1

S7 = a * ( r^n - 1) / ( r - 1)

plug in a = -6, r = 4, and n = 7

you dont need to use the last term

Answer 2

but you complete this?

Answer 3

can you ?

Answer 4

I just have to plug in the numbers right?

Answer 5

yes - and then use ur calculator

Answer 6

try - if you need more help just ask

Answer 7

Yeah I did that. I'm new at doing Arithmetic so I wasn't really sure what all the variables with the numbers attached meant. Thank you

Answer 8

your welcome