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Question 272435: 1. It is estimated in a certain community that the time to distribute phone books to households can be modled by
P=100h/h+20
h=number of hours
p=percent of households that have recieved their books.
Find the percent of books distributed in 10 hours, 50 hours, and 90 hours.
Find the number of hours necessary to distribute telephone books to 4/5 of the population.
Answer by checkley77(12844)   (Show Source):
You can put this solution on YOUR website! P=100h/h+20
p=100*10/(10+20)
p=1,000/30
p=33.3% OF HOMES RECEIVE THEIR BOOKS IN 10 HOURS.
P=100*50/(50+20)
P=5,000/70
71.4 % IN 50 HOURS.
P=100*90/(90+20)
P=9,000/110
P=81.2 % IN 90 HOURS.
80=100*H/(H+20)
80(H+20)=100H
80H+1600=100H
80H-100H=-1600
-20H=-1600
H=-1600/-20
H=80 HOURS SHOULD BE THE REQUIRED TIME FOR 80% TO RECEIVE THEIR BOOKS.
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