Question

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Answer 1

can someone please explain this to me?

Answer 2

in an arithmetic sequence, you're adding by a constant number to each term

what are you adding to 28 to get 8

28 + x = 8

what is x?

it's the same number that when added to 8 gives us -12

8 + x = -12
x = ??

Answer 3

ok i got it tahnks >: D

Answer 4

and then

\( a_n = a_1 + d (n - 1) \)

d is that common number you're adding by
\( a_1\) is going to be the first term which is 28 in this question

n is the nth term and we're looking for the 91st term so n = 91

Answer 5

so were you able to solve for 'x'

that's our 'd' in the equation