Question

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​ᴡʜɪᴄʜ ᴛᴇʀᴍ ᴏꜰ ᴛʜᴇ ᴀᴩ: 21, 18, 15,..... ɪꜱ -81? ᴀʟꜱᴏ, ɪꜱ ᴀɴy ᴛᴇʀᴍ 0? ɢɪᴠᴇ ʀᴇᴀꜱᴏɴ ꜰᴏʀ yᴏᴜʀ ᴀɴꜱᴡᴇʀ.



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Answer 1

Answer:

$a = 21$

$d = 18 - 21 = - 3$

$0 = 21 + (n - 1) - 3$

$0 = 21 + - 3n + 3$

$3n = 24$

$n = 8$

Answer 2

A=21.

D=18-21 = -3.

D=21+(n-1) - 3.

D=21+3n+3.

3n=24.

n= 8.

is your answer.

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