3a^2+6b^3 a=3 and b=2

Which of these choices show a pair of equivalent expressions?

What is the range of the data below? .8090100

The number of potato chips in a bag is normally distributed with a mean of 71 and a standard deviation of 2. approximately what percent of bags contain between 69 and 73 potato chips? approximately 68% approximately 71% approximately 95% approximately 99.7%