book Maths Puzzle Numerical Ability

Can you help me simplify this:
a^2(2a + 4)

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book Other Question

please help me solve this problem: convert 37&1/2 to a reduced fraction. (The answers are...3/6,3/8.75/2, or none of these.) Express the complex number in the form a+bi: 5-2i/4-3i. How do I do this problem.