If the measure of angle 0 is 2/3, which statements are true? tan(0) -V3 The measure of the reference angle is 45º The measure of the reference angle is 30°. The measure of the reference angle is 60° cos(8) = sin(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?