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Mathematics 15 Online
OpenStudy (marcelie):

help please . first term is 6 , common difference is 7 . find the 6th term

OpenStudy (dayakar):

An= a+(n-1)d here , a is the first term d is common difference n = nth term =6 substitute the values and get the answer

OpenStudy (marcelie):

that equals 41 ?

OpenStudy (marcelie):

correct?

OpenStudy (mayankdevnani):

yup ! you are correct

OpenStudy (marcelie):

ah okay. how about this one ? first term is 4 , common difference is 5 . find the 4th term

OpenStudy (mayankdevnani):

use DAYAKAR'S way

OpenStudy (marcelie):

i did it that way but i got 20 . my answer sheet says 19. so idk what i did wrong

OpenStudy (mayankdevnani):

a=4,d=5 use a+(n-1)d

OpenStudy (mayankdevnani):

n=4

OpenStudy (mayankdevnani):

substitute in above equation and get your answer

OpenStudy (marcelie):

isnt first term 5 ?

OpenStudy (mayankdevnani):

nope

OpenStudy (mayankdevnani):

OpenStudy (marcelie):

how come the other equation first term was 6?

OpenStudy (marcelie):

oh nvm lol got it :)

OpenStudy (mayankdevnani):

good

OpenStudy (marcelie):

do you mind helping me with this other equation

OpenStudy (mayankdevnani):

why not ?

OpenStudy (mayankdevnani):

but quick

OpenStudy (marcelie):

okay . find the first term or a 1 of an arithemetic sequence if a 6 = 12 and a 14 = 28

OpenStudy (marcelie):

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