exam Maths Puzzle Numerical Ability

I need some help

Given f(x)=3x^3-4x-6, find vertex,domain, range and axis of symmetry

Thanks for your time

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exam Other Question

Solve.

9/x-5 -1 = 8/x+5
Can anyone help me figure these fractions out, so i CAN HAVE A FORMULA for future references, the slashes are fraction bars. You have a total of 25 coins, all nickels and quarters. The total value is $3.85. Write and solve a system of equations to find the number of nickels n and the number of quarters q that you have.