Question

closed

Answer 1

thats a very good start !
so, u got \(r = 3\)

Answer 2

1st term = 1 = 3^0
2nd term = 3 = 3^1
3rd term = 9 = 3^2
4th term = 27 = 3^3
....
15th term = ?

Answer 3

nope

Answer 4

try again

Answer 5

try again

Answer 6

stare a bit at the pattern :)

Answer 7

1st term = 1 = 3^0
2nd term = 3 = 3^1
3rd term = 9 = 3^2
4th term = 27 = 3^3
....
15th term = 3^14

Answer 8

\(\huge 3^{14}\) is your 15th term

Answer 9

3^14 = 4782969

Answer 10

yes

Answer 11

use below formula :
\(n\)th term for arithmetic sequence :
\(\large a_n = a + (n-1)d\)

\(a\) = first term
\(d\) = common difference

Answer 12

-7, -3, 1, 5, 9,

\(a = -7\)
\(d = 4\)

Answer 13

so, the 1000th term :

\(\large a_{1000} = -7 + (1000-1)*4\)

Answer 14

simplify

Answer 15

remember below :

##arithmetic sequence :
if
first term = \(a\)
common difference = \(d\)

then, \(n\)th term is given by :
\(\color{red}{a_n = a + (n-1)d}\)


##geometric sequencce :
if
first term = \(r\)
common ratio = \(r\)

then, \(n\)th term is given by :
\(\color{red}{a_n = ar^{n-1}}\)

Answer 16

why did u delete replies lol :/

Answer 17

wat did u get after simplifying ?

Answer 18

u shouldnt get a really long number

Answer 19

\(\large a_{1000} = -7 + (1000-1)*4 \)

\(\large ~~~~~~~~= -7 + (999)*4 \)

\(\large ~~~~~~~~= -7 + 3996\)

\(\large ~~~~~~~~= 3989\)

Answer 20

you got that ha ?

Answer 21

@iappreciateyourhelp

Answer 22

may i knw the really long answer u got ha ?b

Answer 23

okay fine

Answer 24

btw deleting ur replies is not okay

Answer 25

openstudy is not meant for using as whiteboard

Answer 26

it is for learning and growing

Answer 27

you can leave ur replies as it is, there is no harm in others looking at them and learning from our discussion