How do i solve n x 721= 72.1 and .074 x n = 74

Hi my sisters and brothers can tell me the answer because i don’t understand the question

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x

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.