Erin invests $500 into an account with a 2.1% interest rate that is compounded semiannually. How much money will she have in this account if she keeps it for 5 years?

Ammonia molecules have three hydrogen atoms and one nitrogen atom.how many of each atom arein five molecules of ammonia

With alll of except for the 2 that i did already

The computer that controls a bank's automatic teller machine crashes a mean of 0.6 times per day. what is the probability that, in any seven-day week, the computer will crash less than 5 times? round your answer to four decimal places