exam Maths Puzzle Numerical Ability

simplify or put in standard terms: (8/27)^-(1/3)

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exam Other Question

can i please get help with this?

x^2-10x+24=0
I dont know how to solve these problems completely.
1. 20x^4-12x^3+8x^2

2.6x^2+2x-20

3.5w^2-20

4.5y^4-405