Lisa is 9 years younger than her brother Paul. Seven years ago, Paul was 4 times as old as Lisa. How old is Paul now?

What could explain what happened when the time was equal to 120 minutes

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Ijust need these 2 questions answered (the second pic is just confirmation i'm not confident in that answer)