Aperson has 22 coins, all nickels and dimes, worth one dollar and 40 cents. if n is the number of nickels and d is the number of dimes, which system of equations could represent this problem?
n+d=1.40
0.05n+0.1d=22
n+d=22
n+d=1.40
n+d=22
0.05n+0.10d=1.40

Can u guys do this ratio question. this is extremely urgent a tap is leaking water at a rage of 1l every 8 hours. how long will it take for the tap to leak a total of 300ml?

Polygon abcd is a rectangle what is the area

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.)