a dog food manufacturer wants to advertise its products. a magazine charges $60 per ad and requires the purchase of at least three ads. a radio station charges $150 per commercial minute and requires the purchase of at least four minutes. each magazine ad reaches $12,000 people while each commercial minute reaches 16,000 people. at most $900 can be spent on advertising. let a represent the number of magazine ads and m represent the number of radio ads. let the ordered pairs be in the form of (a,m)
