3 plots of farm land are for sale

If i have one apple and give you the apple, how many apples do i have?

What is the rate of change of a line that passes through (2,-5) and (6,-2)?

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?