exam Maths Puzzle Numerical Ability

solve{{{343x^3=1}}} (there are 3 solutions one real and 2 complex)

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exam Other Question

log2 (base of 2) of x + 5 (no parentheses) = 8 - log2 (base of 2) of (x+7) If y varies directly with x, and y=400 when x=1000, find the constant of variation k.