I'm pretty sure that it is 140. Hope I helped!
The answer is five
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Using proportions, it is found that the differential equation which describes the growth of the pigeon population is given by:

<h3>What is a proportion?</h3>
A proportion is a fraction of a total amount, and the measures are related using a rule of three.
In this problem, considering the initial population and the population one week later, the rate of growth is given by:
k = 9/6 = 1.5.
The standard differential equation for population growth is:

Hence:

More can be learned about proportions at brainly.com/question/24372153
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The answer is 4ft. you just have to convert the size of the wall and the size of the window to the same thing. Like I converted 9.75 to 39/4. Then you just subtract and what you have left is the answer. Hope I explained that well.