Consider again the system dx/dt = x(1 − x − y), (i) dy/dt = y(0.75 − y − 0.5x), which appeared in Example 1 of Section 7.3. A constant-effort model, applied to the species x alone, assumes that the rate of growth of x is altered by including the term −Ex, where E is a positive constant measuring the effort invested in harvesting members of species x. This assumption means that, for a given effort E, the rate of catch is proportional to the population x, and that for a given population x the rate of catch is proportional to the effort E. Based on this assumption, Eqs. (i) are replaced by dx/dt = x(1 − x − y) − Ex = x(1 − E − x − y), dy/dt = y(0.75 − y − 0.5x). (ii) (c) Draw a direction field and/or a phase portrait for E = E0 and for values of E slightly less than and slightly greater than E0.

Using mathematical software such as MATLAB, Python with matplotlib, or other graphing tools to plot the direction field and phase portrait based on the given equations and parameters.

To draw a direction field and/or a phase portrait for the given system of equations, we need to plot representative vectors in the x-y plane based on the given differential equations. The vectors will indicate the direction of the solutions at different points.

Let's first draw the direction field for E = E0, where E0 is a constant effort.

Direction Field:

To plot the direction field, we choose a grid of points in the x-y plane and calculate the corresponding vectors based on the given differential equations.

Choose a suitable range for x and y, and divide the range into small intervals or grid points. For example, let's choose the range -1 ≤ x ≤ 2 and -1 ≤ y ≤ 2, and divide the range into intervals of 0.2.

For each grid point (x, y), calculate the values of dx/dt and dy/dt using the given equations dx/dt = x(1 − E − x − y) and dy/dt = y(0.75 − y − 0.5x). These values will give us the components of the vectors at each point.

Plot arrows or line segments at each grid point with lengths proportional to the magnitude of the vectors and directions indicating the direction of the vectors.

Repeat this process for multiple grid points to cover the entire range and obtain a representative direction field.

Phase Portrait:

To draw the phase portrait, we need to plot the trajectories or solutions of the differential equations in the x-y plane.

Choose a set of initial conditions (x0, y0) and solve the differential equations numerically or graphically to obtain the trajectories or solution curves. Use different initial conditions to explore different behaviors of the system.

Plot the obtained trajectories or solution curves on the x-y plane.

Repeat this process for different sets of initial conditions to get an overall view of the phase portrait.

Note that for values of E slightly less than and slightly greater than E0, you can repeat the above steps with the corresponding values of E to observe any changes in the direction field or phase portrait.Unfortunately, I am unable to generate visual plots directly in this text-based format. I suggest using mathematical software such as MATLAB, Python with matplotlib, or other graphing tools to plot the direction field and phase portrait based on the given equations and parameters.

To know more about MATLAB.

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A sum of money is divided between Mohan and Sohan in the ratio 5:7 . If Sohan's share is ₹665, find the total amount.​
please help me fast.

what's
[tex](4 \sqrt{2} ) {}^{2} [/tex]
​

Select the three inequalities that have n = 3 in the solution set
A. n + 5 < 9
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D. 3n > 9.5
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math help me pls now now

hi help again lol :)​

Complete the sentence.

A cell phone costs $750 and loses 28% of its value each year. Write an exponential decay function to represent this situation.

1. f(x)= 750 • 0.72^x
2. f(x)= 0.72 • 750^x
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3
Gürkan bisikletiyle birinci gün 3.1 km, ikinci gun 4.5 km ve puncu
gun 4.25 km yol almıştır Gürkan üç günde toplam kaç km yol aims
tir? Tahmin ediniz Tahmininizi işlem yaparak kontrol ediniz.
​

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Please help me! 20 points!
Enter your answer and show all the steps that you use to solve this problem in the space provided.

simplify
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Replace the words 'workout time" with.
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a.) integer
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Solve the system of linear equations by elimination x + 2y = 13 --x+y=5​

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which of the given values will make the inequality n-93>175 true?

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n=105
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Radius of the satellite signal = meters

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=32+54−2+8=−25