- Which landform would be hardest to hike through? why?

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What is the sum from n=1 to ∞ of (-1)^(n+1) π^(2n) / (2n+1)!? How many pounds of caviar does one sturgeon produce? Can anyone solve any of these questions? I think a lot talented here to help me.? A rotating fan completes 1200 per min. What distance does the point move in one revolution on the tip of a blade, at a radius of 0.15m? I need help with this question on linear approximations. Please show y?