I dont know all of them, but I know P stands for principal amount (what you start with), t stands for the amount of time it takes in years, and I think r is the rate anually that money is made
Answer:
you can see the answers to your
34.45 because you just have to multiply 5.3 by 6.5
.57 because 57/100 is like 57% and pretend that the percent is like a magnet and pulls the decimal two spaces to the right