Question

What is the 20th term of the arithmetic sequence 5, -1, -7, … ?

Answer 1

d = common difference = -1 - 5 = -6
nth term = a + (n-1)d

Answer 2

n is 20 , right ?

Answer 3

look carefully to the question,every term is adding -6 with it to gt the next term.

Answer 4

here a = 5 d = -6 and a = 20

Answer 5

Yes..

Answer 6

sorry n = 20

Answer 7

take this pattern to 20th term .u will probably gt ur answer

Answer 8

So:

\[t_{20} = 5 + (20-1)(-6)\]

Answer 9

yep

Answer 10

-120 ?

Answer 11

NO try it once more..

What is 19*-6) = ??

Answer 12

19*(-6) = ???

Answer 13

-114 . sorry i did 20x6-5

Answer 14

-114 + 5 = ??

Answer 15

-109

Answer 16

yea

Answer 17

Yes absolutely..

Answer 18

YAY! thanks :) there will probably be more questions like this to come ... :/ i'm awful at sequences & series :(

Answer 19

Welcome dear..