Solve problem (9+4)+(9+24÷8)=

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?

Using inductive reasoning, what are the next two number in this set? 2,3/2,4/3,5/4,

Which is the scale factor proportion for the enlargement shown?