What number multiplied by 86 will give the same product as 163 multiplied by 430?

Sole with work in 10 years, the average number of hours of tv watched per week by teenagers dropped from 23.9 to 21.4. find the percent of change.

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%

Jimmy can run 3.5 miles in 20 minutes. how far can ne run in one hour and ten minutes?