The rate of growth of mice is inversely proportional to the square of the population:

The value is  

Step-by-step explanation:

From the question we told that are

      The rate of growth of mice is inversely proportional to the square of the population

   This above statement can be mathematically represented as

Here   is the population

=>    

=>    

step-by-step explanation:

given perimeter: 28cm

length: 9cm

atp,

2(l+w)=p of the reactangle

2(9+x)=28

18+2x=28

2x=28-18

x=10/2

x=5

therefore width is 5 cm