exam Maths Puzzle Numerical Ability

Simplify:

(6+1/3)/(3-2/9)

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exam Other Question

solve the inequality, with answer in interval notation

|2x-3| is less than or equal to 20 Please explain why it is that -3^4=-81(a negitive number),
yet, -(3)^4=81, a positive number.
Is it because 2 negitives= a positive?