book Maths Puzzle Numerical Ability

The figure shows the graphs of f(x) = x3 and g(x) = ax3. What can
you conclude about the value of a?

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book Other Question

How do you solve, in step by step form:
-(3/5)[2/3-1/2(3/4-1/2)]
I need someone to tutor me in arithmetic sequences and series. Can someone tell desribe in depth how to do both functions? I have a test tomorrow.