- The keeling curve varies on an annual basis, how does this relate to the distribution of forests?

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Pete walked to Jack's house by the shortest route. About how far did he walk?
(A) 600 metres (B) 700 metres (C) 800 metres (D) 900 metres? 3x^2-3x-4=0 quadratic formula please help? Factor completely using the formula for sum or difference of cubes. y^3-216
My answer is (y-6)(y^2+2y-36) Where is mistake? How do i find the range of f(x): 1 / (x^2 + 7) ? R^2+3t-1=0, quadratic formal. please help?