exam Maths Puzzle Numerical Ability

please put in simple terms that i can understand

v=r+at, for the a

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exam Other Question

Please help i do not understand how to solve this equation??
x-5y=10
2x-10y=20 Subtract.

4x - 2x squared - 8x to the 3rd power FROM 4x to the 3rd power + x - 3x squared