Aswimming pool and deck are built in a rectangle with length 40 ft and width 18 ft. if the pool itself is 320 square feet, what is the area of the deck itself?
a) 320 square feet
b) 400 square feet
c) 480 square feet
d) 560 square feet

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.