Perth mining company operates two mines for the purpose of extracting gold and silver. the saddle mine costs $16,000/day to operate, and it yields 45 oz of gold and 2000 oz of silver each of x days. the horseshoe mine costs $17,000/day to operate, and it yields 70 oz of gold and 1250 oz of silver each of y days. company management has set a target of at least 750 oz of gold and 16,000 oz of silver. how many days should each mine be operated so that the target can be met at a minimum cost c in dollars

Adog whistle manufacturer's factory was located near a residential area. the manufacturer used the most effective methods for testing its whistles, but it was impossible to completely soundproof the testing area. a breeder of champion show dogs bought some property near the factory and raised and trained her dogs there. although the whistles were too high-pitched to be perceived by human ears, they could be heard by the breeder's dogs. consequently, the dogs often were in a constant state of agitation. in a suit by the breeder against the manufacturer, what is the likely outcome? response - correct a the breeder will prevail on a trespass theory, because the sound waves are entering onto the breeder's property. b the breeder will prevail on a nuisance theory, because the sound of the whistles is a substantial interference with the breeder's use of her land. c the breeder will not prevail, because the sound of the whistles is not a substantial interference with the breeder's use of her land. d the breeder will not prevail, because the manufacturer has acted reasonably in testing its whistles.