book Maths Puzzle Numerical Ability

please do this for me3/9z+8=12

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book Other Question

Find the domain of the functions:

(a). f(x)= the sqaure root of 3-x

(b). g(x)= x/x^2-5x ALG.2
hi i am having trouble figuring out this problem...its finding the variable...

Y=u+1/u+2 find the variable for U.

thank you