What’s the unite rate

How to choose the sign of the radical in the denominator of the formula for the distance from a point to a line.

You can find the constant of proportionality by finding the ratio of

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%