How many lines of symmetry does a rectangle have?

Write an equation for the function that includes the points (1,4/5) and (2,2/3)

Ihave trouble finding the nth term of a linear sequence

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?