Question $12(3\mathrm{.}7$ points$)$

Assume that R$4$ is the load of the circuit, What value of R$4$ will maximize the power transfer when $E=7V,R1=10,R2=5,$ and $R3=30?$

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Question $13(3\mathrm{.}7$ points$)$

Assume that R$4$ is the load of the circuit, What is the power in R$4$ in Watts when $E=10V,R1=100,R2=800,R3=200$ and $R4=1,000?$