13.989 to the nearest tenth

What is the value of the expression below? (81^2)^1/8

Which of the following is most likely the next step in the series? a3z, b6y, c9x, d12w, е15v, f18u

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.