Which is greater 4/16 or 16/64

What value of x will make the triangles similar by the sss similarity theorem?

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?