Workout and answer this 2c+4=8

Tom had a total of $220 and he spent $35 on a basketball ticket . what percent of his money did he have left?

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?

Plz : denver is about 5,200 feet above sea level. which number line best represents this integer?