1a) 1b) Please show every step thank you!

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1a)

1a 1b Please Show Every Step Thank You 1 (30.29 KiB) Viewed 42 times

1b)

1a 1b Please Show Every Step Thank You 2 (45.66 KiB) Viewed 42 times

Please show every step thank you!
Find the Error Sensitivity TF for the each of the three noise inputs to the block diagram below N2(s) N1(s) N3(s) U(s) G1 G2 + G3 + Y(s)

If you could add a block with a constant gain value of 100 to any point in the system along an existing signal, where would be the best location to add this block to reduce the overall affect of noise on the system and why? N2(s) N3(s) N1(s) U(s) G1 Constant value gain block: 100 + G3 G2 Y(s)