The conversation of square feet to square yards can be represented by direct variation. Three square yards are equivalent to 27 square feet. Let Y represent the number of square yards and x the number of square feet. Then y varies directly with x. What is the constant of variation? What is the equation representing a direct variation?

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.