To ship a package, a freight carrier charges $0.75 for the first pound and $0.25 for every pound (or part of a pound) over the first pound. A package weighs 3,456 grams. How many pounds does the package weigh? How much will it cost to ship the package?

What is the missing step in this proof ?

What numbers are included in the set of integers? what numbers are not included?

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.