Let f: XY and g: Y→ V be functions. Show the following: (a) f is injective 3h: Y→X such that ho f = idx (b) f is surjective 3h : Y→ X such that fo h= idy Use: v injective if x1 ‡xn → v(x1) = v(xn) How to prove these <-> How to proof with the arrows <-> (do you prove both rhs and lhs)

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Q: 3:7:4=27:_:_

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A: Follow the steps.

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A: With a suitable substitution and then apply

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Q: Deliymine the Pripes Tua yectangle the 715 Nil lineay by any Z₁ = 0, 2₂ = 1/2₁ 2₂ = 1 and ²4=1+ N₁ =…

A: HINT : USING CROSS RATIO METHOD  w1-w2w3-w4w1-w4w3-w2 = z1-z2z3-z4z1-z4z3-z2