Which quadratic equation is equivalent to (x – 4)2 – (x – 4) – 6 = 0? A.(u – 4)2 – (u – 4) – 6 = 0 where u = (x – 4) B, u2 – (u – 4) – 6 = 0 where u = (x – 4) C. u2 – 16 – u – 6 = 0 where u = (x – 4) D. u2 – u – 6 = 0 where u = (x – 4)

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.