exam Maths Puzzle Numerical Ability

I dont have any clue as to what i need to do for this problem.
(x^3*x^4/x^2)^6

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exam Other Question

The daily double at most race tracks consists of selecting the winning horse in both the first and second races. If the first race has 8 entries and the second race has 9 entries, how many daily double tickets must be purchased to guarantee a win? solve the following equation
3/z-3 + 5/z-1 = 8/z-2
A) z=-4
B) z=-6
C) z=4
D) z=6