Overdue assignments

So pissed off at this schoolwork, its math UEGH. Ive got abt 12 overdue assginments, and the teacher gave the formula, so i use it - BUT IT DOESNT MAKE ANY DAMN SENSE. SO I GOOGLE THE FORMULA AND ITS SMTH DIFF?? im js gonna put the math on hold, and reach out to my teacher coz i cant w/ this SOBS