Let y(t)= r(t)-2r(t-1)+r(t-3)+u(t-4), where r(t) is the ramp function. a) plot y(t) (10 pts.) b) plot z(t)=y(2t-1) (10 pts.) c) plot y'(t) (10 pts.) d) calculate the energy of y(t) (10 pts.) note: r(t)=t for t≥0 and 0 for t<0

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Q: 49y" — 42y + 5y = 0, and - y(4) = 4, y'(4) = 1. y =

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