What's so special about the relationship between
parallel and perpendicular

The perimeter of a stage is 116 feet. it is 17 feet wide. how long is it?

For each proportion find the unknown number x 1/5/8=×/15

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%