Which of the following statements is false?
A. (8y^2+2)-(4-2y^2)=10y^2-2
B. (y^2-7)+(2y+2)=2y^2-9
C. (y^2-7)+(2y^2+3)=3y^2-4
D. (y^3-y)-(y^2+4)=y^3-y^2-y-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.