The pressure p (in pounds per square foot), in a pipe varies over time. ten times an hour, the pressure oscillates from a low of 60 to a high of 300 and then back to a low of 60. the pressure at time t=0 is 60. let the function p=f(t) denote the pressure in pipe at time t minutes. find a possible formula for the function p=f(t) described above.

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.