exam Maths Puzzle Numerical Ability

Hi,
I need help with this problem: {{{3x^3-4x=1}}}. I'm unsure how to factor it because of the cube. I moved the one to the other side and tried to factor it, but found i couldnt

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exam Other Question

Please help me graph these equationss 3x-y=9 3x+2y=12
y=2/3x+4 y=-3/2x-6 Thank You!!!!
A bookstore offers wireless Internet access to itscustomers for a charge.The cost is $1.50+m over 20,m=# of minutes.
How much would it be for 40 minutes?