exam Maths Puzzle Numerical Ability

I have a test coming up soom, and the instructor give us some problem for practice, but I am having some problem with the subject, can you explain me this two problems?

2. Suppo

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exam Other Question

/x+4=3
This is what I did:
(/x+4)^2=3^2
x+8=9
x=1
Is this correct or did I miss a step?
Thank you!
ac
Surface area of cylinder with radius 5ft and height 8ft