book Maths Puzzle Numerical Ability

6^-2y^3z^-2/-2x^4y

please simplify and write the answer without negative exponents

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book Other Question

At noon, one ship sails north from Castaway Island at 15 knots and another ship sails east at 20 knots. How far apart will they be at 2:00 p.m.? Where do I start? I am so lost... here is the problem...

Given f(x)=6x^2 + 5x - 4 find [f(x+h)-f(x)] / h