exam Maths Puzzle Numerical Ability

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find the center and the radius of the circle given by x^2+8x+y^2+6y-24=0

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Suppose A=QR, where Q and R are n*n, R is invertible and upper triangular, and Q has the property that (Q^T)Q = I. Show that for each b in R^n, the equation Ax=b has a unique solut The Quotient of 3b and 4.5