The radius of a cylinder is decreasing at a constant rate of 4 feet per minute, and the volume is decreasing at a rate of 841 cubic feet per minute. at the instant when the height of the cylinder is
9
9 feet and the volume is 513 cubic feet, what is the rate of change of the height? the volume of a cylinder can be found with the equation
v
=
π
r
2
h
.
v=πr
2
h. round your answer to three decimal places.

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.