exam Maths Puzzle Numerical Ability

how do I find the domain of f(x)= radicalx^2 - 4

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exam Other Question

solve for x by using the quadratic formula: 9x^2-6x+5=0
thanks so much
I am trying to write a program where I must do the following:

The program will calcuate shipping charges for a given package weight, based on these rates:

Per every 500 miles