ford45
09.12.2019 •
Mathematics
Five mice in s stable population of 500 are infected with a contagious disease to test a theory of epidemic spread that postulates that the rate of change in the infected population is proportional to the product of the number of mice who have the disease with the number that are disease free. assuming the theory is correct and using the fact that 80 mice were infected after 4 hours, how long will it take half of the population to contract the disease?
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Ответ:
y > -8
Step-by-step explanation:
25 > -(4y + 7)
Divide by -1 (don't forget to flip the sign).
-25 < 4y + 7
Subtract 7:
-32 < 4y
Divide by 4:
-8 < y
The solution is y > -8.