Simplify this 10m²n + 7mn² - m²n

Which expression gives the area of the triangle shown below

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?

15 and 14.7 are 1 apart, so 15 – 14.7 must be 1.