exam Maths Puzzle Numerical Ability

(4 / x^6) ^3 I need to simplify it and I am pulling my hair out. Maybe I am too old for this! Can you possibly show me a detailed explanation?

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exam Other Question

solve the system by addition method. if a unique solution does not exist, state whether they system is inconsistent or dependent.
x+8y=10
-x+y-2z=-3
3x-2y+5z=9
Graphing the equation y=x-7 and 2x+5y=10