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so far we have
first term: -21
second term: -21+d
third term: -21+2d
what would be the fourth term?

-21 + 3d?

correct, how about the fifth term?

-21 + 6d

you add d to the fourth term
fifth term = (fourth term) + d

4d

one thing, how is the 6th term equal to -36?

d = -3

we have this sequence at first
|dw:1439334777260:dw|

|dw:1439334815361:dw|

|dw:1439334837901:dw|

the X,Y,Z,W in the middle represents the second through fifth terms

but how did you know it was 6 terms between?

there are 4 terms between and not 6

ohh i get it! thank you, btw i got -3

correct, d = -3

now compute
-21+d
-21+2d
-21+3d
-21+4d
to get those four unknown terms

-24 , -27, -30, -33 all of them are the anwser?
sorry i was called out of the room for a second

very good, you got it

sure