HELP A BRUDDA OUT YO!!

complicated graphing calculators that you never really understand

I did everything right but the answer is still wrong! ;__;

what calculator are you using?!

TI 83 Plus. D: ichi sent me a helpful site but its still wrong and I dont kno why.

what kind of problem are you doing?

scatter plot/ cubic regression

ewww well i have TI 89 titanium so i cant help you there sry