Using sets what is the intersection of a=(-2-1,0,1,7) I=(-2,-1,1,2,8)​

Michael's team is trying to determine how they can process shipments more quickly. He has convened a large group to come up with some ideas, but only a few people are driving the conversation. Which rule of good brainstorming is this violating? O a) All ideas are recorded b) Make sure everyone participates O c) No one may criticize another person's idea d) Evaluate ideas after everything is on the table

The answer is (-2,-1,1)

No he does not because he can only cover 12 square feet from 15 square feet which he will still need 3 more. this is because if 3×5=15 square feet and 15-12=3 which thats the answer