I need help real quick

What is the point-slope form of the equation for the line with a slope of -2 that passes through (1,4)?

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 is the distance between point a and b