exam Maths Puzzle Numerical Ability

Please..i am having a lot of trouble with these. any help would appreciated.

f(x) = 7/|5x-9|

g(x) = 8/3-7x

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exam Other Question

what is the scientific notation for 135,000? Simplify (2x cubed-2x square-12x)(x to the 4th power -2x cubed-8x squared)power of -1
A.2x(xsquared-7x+12)
B.2(x-3)over x(x-4)
C.3 over 2x
D.2x