Match each exponential equation to its percent rate of change. 80% growth
40% decay
60% decay
80% decay
60% growth
20% growth
20% decay
40% growth

1.2(1.4)' = 80
20(0.6)' = 1.2
40(0.2)' = 1.6
600.8)' = 1.4
801.67 = 20

Hel please)):

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?