book Maths Puzzle Numerical Ability

How do I find the sum of 4e^31 and 5e^2i? What is the value?

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book Other Question

If N(t)=N(0)a^pi^t

How would you determine:
1) N(0)
2) pi

Thanks
Please help me to simplify the following fraction:
.
(x^3+2x^2y+2xy^2+y^3)(3x^2+8x-3)
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(3x^2-x+3xy-y)(x^4+3x^3-xy^3-3y^3)