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Volume of a cylinder with a radius of 13 in and height of 30 in

Which of the following represents a number squared is equal to twenty more than nine times that number ? a) x squared = 9x + 20 b) x squared = 20x + 9 c) x squared > 9 + 20x d) x squared = 9 + x + 20

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)