1. Find 4B. B= -3 1
2 -4
-1 5

How to do this , and can some one explain

Aflower has 26 chromosomes. to create a new flower,how many would a sperm cell have what is called?

Sarah took the advertising department from her company on a round trip to meet with a potential client. including sarah a total of 11 people took the trip. she was able to purchase coach tickets for $280 and first class tickets for $1280. she used her total budget for airfare for the trip, which was $6080. how many first class tickets did she buy? how many coach tickets did she buy?