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SOLVED: Suppose that one solution Y1 of the homogeneous second-order linear differential equation y' p(x)y' q(x)y = 0 is known (on an interval where p and q are continuous functions). The method of reduction of order consists of substituting Y2 (x) = v(x)y1 and attempting to determine the function V(x) so that y2(x) is a second linearly independent solution of the above differential equation. After substituting y=v(x)y1 in the above differential equation, use the fact that Y1 (x) is a soluti
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A 30 -year-old woman accepts an engineering position with a starting salary of 30,000 per year. Her salary S(t) increases exponentially, with S(t)=30 e^t / 20 thousand dollars after t years. Meanwhile, 12 % of her salary is deposited continuously in a retirement account, which accumulates interest at a continuous annual rate of 6 %. (a) Estimate ΔA in terms of Δt to derive the differential equation satisfied by the amount A(t) in her retirement account after t years. (b) Compute A(40), the amou
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