I promise it's not a quiz but it is for an assignment and I'm confused

How can you construct perpendicular lines and prove theorems about perpendicular lines

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.

Typically a point in a three dimensional cartesian coordinate system is represented by which of the following answers in the picture !