Jaime adds equations A and B to solve this system of equations. Why is this method generally valid for solving a system of equations?

Would greatly appreciate these 3 answers

An oil exploration company currently has two active projects, one in asia and the other in europe. let a be the event that the asian project is successful and b be the event that the european project is successful. suppose that a and b are independent events with p(a) = 0.2 and p(b) = 0.8. (a) if the asian project is not successful, what is the probability that the european project is also not successful? (b) what is the probability that at least one of the two projects will be successful? (c) given that at least one of the two projects is successful, what is the probability that only the asian project is successful? (round your answer to three decimal places.)

Ryan’s condos fees are $225 each month. tell whether each situation can be modeled by a linear function or an exponential function. explain.