Zachary purchased a new car for $21,995. The value of the car linearly depreciated to $9,100 over 10 years. Write a linear equation to represent the value y of Zachary's car (in dollars) after x years since its purchase.

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.