Please do exercises 18-20 and find the missing measure

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%

The square root of 9x plus 7 plus the square rot of 2x equall to 7

Nikolas calculated the volume of the prism. his work is shown below.