Atree's root is 13 feet below ground and spans a radius of 8 feet. if the tree's elevation above ground is 28 feet with branches that span a radius of 12 feet. what is the total length of the tree from root to top?

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.