question 1 information

Let the starting values of the model parameters be: r = 1.3, k = 1, s = .5, v = 1.6, and u = .7

Let the starting population of P = 1.1 and Q = .4

Difference equations: P[t + 1] = P[t](1 + r(1 P[t]/K)) - sP[t]Q[t]

Qt + 1 = (1-u)Q[t] + vP[t]Q[t]

Question #2

Create an Excel worksheet representing another population model. Use the instructions from question 1, except that your model should now include a term to represent the amount of prey which cannot be eaten because they are hiding in refuges (just like in question 2) represented by the term: w. Also, for the predators, include a term f representing what happens if a constant, external food source contributes to the predator population.

Let w = 0.3 and let f = 0.25

a. Graph the new population levels.

b. Explore different values of w and f. Try setting w = 0, or f = 0 to see what effect each of these has individually. Describe your results.

I only need help with question #2

thank you !!