Question

Find

Answer 1

2,054
2,119
2,142
2,212

Answer 2

i got 2212 am i correct?@mathmate

Answer 3

@mathmate

Answer 4

Yes, 2212 is correct.
Did you apply the same formula? Hope you did not calculate all 14 terms and added them up!

Answer 5

1 more question

Answer 6

Find the 6th partial sum of

Answer 7

78,432
11,204
9,555
2,387

Answer 8

don't know how to do this one

Answer 9

Do you know the formula for sum of geometric series?

Answer 10

is it Sn=(a1-a1r^n)/(1-r)

Answer 11

Yes, or same as
\(Sn=a1(1-r^n)/(1-r)\)

Answer 12

What is your a1?

Answer 13

7

Answer 14

r=?

Answer 15

4

Answer 16

So substitute in formula and see what you get...

Answer 17

wats n?

Answer 18

You're calculating S13, so n=13.

Answer 19

how did u get 13?im confused

Answer 20

Sn=a1(1−r^n)/(1−r)
n stands for the nth partial sum.
Oh, 6th partial sum, so n=6! sorry! :(

Answer 21

ok

Answer 22

What do you get?

Answer 23

just a sec

Answer 24

got 9555

Answer 25

thnx

Answer 26

9555 is correct!
Congrats again!
:)