How are difference in distance related when subtracting?

Assemble the proof by dragging tiles to the statements and reasons column

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%

What are the sotions to the quadratic equation 9x^2=4