exam Maths Puzzle Numerical Ability

Please help me with this:

log base 7 [log base 2(log base 3(x-1) - log base 3 (x+2))]=0

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exam Other Question

Is (x-2) a factor of 3x^4+6x^3-30x^2+16x-8? Why or Why not? how many milileters of a 20% acis solution must be mixed with 30ml of an 80% acid solution to make a 32% acid solution? i have to show a chart and fill it out