book Maths Puzzle Numerical Ability

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.

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book Other Question
The figure shows the graphs of f(x) = x3 and g(x) = ax3. What can
you conclude about the value of a? Write these four values form lowest to highest. -3, 3 1/2, 3.2, -5