- HELP PLS! Prove ∑ [n=1 to ∞) nx^n = x/(1-x)^2?

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How much is the fair? Estando a la misma temperatura 2 kg de hierro contienen mas calor que 1 kg del mismo metal? Alguien me puede ayudar por favor Gracias? Use polar coordinates to find the volume of the given solid.
Inside the sphere x^2 + y^2 + z^2 = 25 and outside the cylinder x^2 + y^2 = 4? The exponent is the number that indicates how many times the base is used as a factor? What's the difference and similarities between bears and dogs?