exam Maths Puzzle Numerical Ability

Add. Simplify if possible.

2r/r^2-4 + r/r-2

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exam Other Question

Solve for x: (27)(^x-2)=(9^1/3)^x I think the answer is x=4 ?????????/ simplify:

(3x^3-1+9x) + (3 + 3x)

I have 4 answers to choose from:

a)x^2-x+4 r11
b)x^2+2x r-7
c)x^2+2x r5
d)x^2-x+4 r-13