The answer is -48. Here is how to solve!
The main system<span> of weights and measures used in the United States and a few other countries. </span>
80*4=320
89*4=356
This is the range of the addition of all 4 scores.
99+80+70=249
320-249= 71
356-249= 107
[71, 100] would be the answer, unless you can get extra credit on the final.