Book Maths Puzzle Percentage

what persent is 20%out of 576.00?

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Book Other Question

I can't find an example in my book or any where. Please help. Thank you.
x^2 (x^2) + 7x +6=0

I am supposed to find the Quadratic. Quadratic what? Solve by completing the square.
z^2 + z = 2