exam Maths Puzzle Numerical Ability

Please answer this question. I do not know how to solve a problem to the -2/3 power. What is the answer to 27^(-2/3) (-2/3) being the exponent

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exam Other Question

The sum of two numbers is 38. Their difference is 10. What are the two numbers? Determine whether the following trinomials is a perfect square. If it is, factor the trinomial.

x^2 - 24x + 48

This problem has me confused and need some help. Thanks.