The circumference of f is 96 ft what is the length of de the minor arc

How do you use the elimination method for this question? explain, because i really want to understand!

When the ball has traveled a distance 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%