book Maths Puzzle Numerical Ability

Simplify

(x^-3/4 y^1/3)(x^1/2y^1/5)

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book Other Question

plot the graph c=x-x2+6 for x=-3 to 3 I dont even know where to start the question is
Find the common difference of the arithmetic sequence:
1/2, 1/6, -1/6, -1/2