Question

What is S10 for 1+3+9+27?

Answer 1

i think that it is timesd by three. the options are
a. 9,841
b. 29,525
c. 14,762
d. 29,524

Answer 2

an = a1 * r^(n-1)

where r = common ratio and a1 = first term

Answer 3

and n = 10

Answer 4

let me know what you get

Answer 5

what is the common ratio? 3?

Answer 6

yes

Answer 7

ok

Answer 8

oh wait

Answer 9

just a moment

Answer 10

wrong formula

Answer 11

this one should work

https://www.mathsisfun.com/algebra/images/partial-sum-i.gif

Answer 12

oh ok

Answer 13

i dont really get it

Answer 14

a = 1
r = 3
n = 10

plug these into the formula and solve

Answer 15

what is the big e thing?

Answer 16

that's sigma

Answer 17

just pay attention to this part:

Answer 18

sigma (the E thing) just means this is a sum formula

Answer 19

1(1-3^10/1-3)

Answer 20

yes but what does that equal?

Answer 21

29525.5

Answer 22

good! (that extra .5 is probably rounding error)

so 29,525 is your answer

Answer 23

okay thank you