Bill and colin are cousins. right now bill is 21 years older than colin. in 13 years
bill's age will be twice colin's age. how old is colin right now? how old is bill?

Acertain population of bacteria demonstrates exponential growth doubles in size every 4 days. how long will it take the population to triple in size?

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%

Which strategy is used by public health to reduce the incidence of food poisoning?