exam Maths Puzzle Numerical Ability

How do I solve -3/5[2/3-1/2(3/4-1/2)]= ?

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exam Other Question

A circle is inscribed in a square and a regular hexagon is inscribed in that circle. The area of the square is 36 square cm. Find the following:
A) The perimeter of the square
Simplify. Assume x represents a positive number.

sqrt5x^2