book Maths Puzzle Numerical Ability

How do you solve, in step by step form:
-(3/5)[2/3-1/2(3/4-1/2)]

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book Other Question

How do you solve 3 over the square root of 48 The figure shows the graphs of f(x) = x3 and g(x) = ax3. What can
you conclude about the value of a?