Which relation does not represent a function? 1 2 3 4 5 6 y = 3vx+1 - 2 у 3.2 4 5.1 6 7.4 8.8​

I'm terrible at math any here is appreciated.

The suare root of 9x plus 7 plus the square rot of 2x equall to 7

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.