plz help!
what should go in the brackets?
9500,7800,7100,( ),4000,3100,1700
it could be $\displaystyle 7275$, $\displaystyle 5875$, $\displaystyle \frac{15875}{3}$, or $\displaystyle 5525$. i think.
it would help if you gave more context....like what class this problem came up in, and what else you are learning. the answers to these types of questions are highly dependent on the context of the pattern. in theory, the missing term could be anything you want it to be.