exam Maths Puzzle Numerical Ability

Please show me how to simplify and write answer using only positive exponents.

Thanks!

(5K^-4m^6)^-2

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exam Other Question

The second hand on a clock is 6 inches long. How far does the tip of the hand move in 40 seconds? f(x) = 2^3x and g(x) = 8^-x

Explain the reason for the graphical behaviour of the pair of functions above.