In this question we reconsider the si epidemic model allowing the infectious contact rate to be a function of time. the model equations are di = -bsi s(0) = si, i (0) = ii, 8si b = bo (1.5 +1.4 cos (356)] (a) consider the equation y= a + b cos (wt). what is the physical meaning of the parameters a, b, and 12? (b) in our definition of the infectious contact rate what is the significance of the term 27/365? (c) why might the infectiour contact rate vary in a periodic manner? (d) plot b/bo as a function of time. (e) reduce the system of equations to a single differential equation for the rate of change of the number of susceptibles in the population. solve this differential equation to find the number of susceptibles as a function of time. express your answer in terms of the initial number of infectives in the population - not the initial number of susceptibles in the population. (f) consider the parameter values li = 200, k = 30,000 individuals, bo = 0.4 x 10-6 individuals - 1 day-1. (i) plot the number of susceptibles as a function of time (0

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step-by-step explanation:

answer: a video game has three difficulty levels: easy, medium, and expert. the game's scoring works in such a way that a player has to score a fixed number of points to advance to the next level, and then the scoring starts over. the total score needed to clear all three difficulty levels is 7,500. two times the number of points needed to clear the easy level is 500 more than the number of points needed to clear the medium level. twice the number of points needed to clear the medium difficulty level is 1,500 more than the number of points needed to clear the expert level. if x, y, and z represent the easy, medium, and expert levels, respectively, and a is the coefficient matrix of the system of equations modeling this situation, identify the inverse matrix, a-1, and the solution matrix, x, of the system of equations.

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step-by-step explanation:

step-by-step explanation:

the true statements are:

r = set of real numbers

n = set of natural numbers, 1,2,

w = n u{0} = {0,1,}