exam Maths Puzzle Numerical Ability

Please help solve this equation: 25x^3 - 10x + 1

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exam Other Question

Please help me with the following problems. Thank you very much!!!
1)Write a pieces wise function for f(x)=24x-3 (absolute value)
2)Sketch a graph of f(x)= 15x+5, x <1 and 2x-8, How do I sovle this one?
ay/x=cz
solve for the varable z