Which statement is true?

Which expression gives you the distance between the points (5,1)and(9,-6)

Equation for the calculation double 2 and then add 5

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?