3. (09. HC) Write the quadratic equation of the following graph in standard form. Fully justify: Show all steps in your work to receive full credit! Upload a picture of your work if needed. * Remember to test the vertex to make sure it works ! (1, 18); (- 2, 0); 1(4, 0) ( 10 points )

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.