Todor was trying to factor 10x^2-5x+15

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%

Anyone know? is appreciated! will mark brainliest if correct!

Which expression gives you the distance between the points (5,1)and(9,-6)