If I understand your question correctly then it's simple all you have to do is use the numbers in the place of the b and c so the question would be what is 8-7 which equals 1
- 1 1/3 - 2 1/5
= -4/3 - 11/5
= -20/15 - 33/15
= -53/15
= -3 8/15 mg/L
Answer: stop pay attention in class
Step-by-step explanation:
