Question

arithmetic sequences..



Identify the 31st term of an arithmetic sequence where a1 = 26 and a22 = -226.
-334
-274
-284
-346
I am not sure of myself. help me?

Answer 1

@modphysnoob can you help me on this one too? I did the subtraction and I got -12 but idk where to go after that..

Answer 2

ok, so difference is -12

a_1+ (-12) *30

Answer 3

i am really not understanding how you set that up.

Answer 4

always remember this setup

a_n= a_1+ d (n-1)

so if your case n=31

a_31= a_1+ (-12) (30)

Answer 5

i got -361.. but that's not in the answer choices.

Answer 6

26+(-12)*30=

Answer 7

-334

Answer 8

yds

Answer 9

thank you!