Joseph and his younger brother, Ryan, are taking a backpacking trip and must pack a total of 12 gallons of water. Ryan will carry 4 less than half the number of gallons Joseph will carry. Let x be the number of gallons Joseph carries and let y be the number of gallons Ryan carries​

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.