The snack machine at the mall is broken. it will not take any quarters. it only takes dimes and nickels. a snack costs 45 cents. if antonio has 15 cents in nickels and enough dimes to purchase a snack, how many dimes does he have?

An office supply company conducted a survey before marketing a new paper shredder designed for home use. in the survey, 80 % of the people who tried the shredder were satisfied with it. because of this high satisfaction rate, the company decided to market the new shredder. assume that 80 % of all people are satisfied with this shredder. during a certain month, 100 customers bought this shredder. find the probability that of these 100 customers, the number who are satisfied is 69 or fewer.