book Maths Puzzle Numerical Ability

8_______ - 3
x^2-4 x-2

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book Other Question

Can you explain the functions of x better to me? Just started Class and I am not understanding it What is the circumference of a circle if the area of the circle is 64? My homework gives me 5 choices.
1) 8
2) 16
3) 8 divided by the square root of pie
4)16 times the square root of pie
5) 32 times pie