Suppose a group of x people rent a jeep for $80 for a trip to the beach and plan to share the cost equally. if one person in the group decides not to go, each remaining person has to pay an extra $4. which equation could be used to determine how many people are in the group? a) x − 1 80 − 80 x = 4 b) 80 x − 1 − x 80 = 4 c) 80 x + 1 − 80 x = 4 d) 80 x − 1 − 80 x = 4

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.