exam Maths Puzzle Numerical Ability

Find each product
1.(3x)(4x^3)(-x^5)
2.5x^3(4x^5-2x)
3. (5x-2y)^2
4. (5x+1)(3x^2-3x-2)

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exam Other Question

How many kg of water must be evaporated from 50kg of a 10% salt solution to obtain a 15% salt solution?

This was given to me out of a GEPA math tutorial book. How would you write this rational expression in lowest terms?

a^2-9/18-2a^2