- What is keyword density?

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A nail put into tree at height of 2m from ground.This tree grows at rate of 0.5m a year. How high above ground will nail be after 20 years.? I need help with 2 unusual factoring problems. Problem 1: 4x^4+32x^3+47x^2-8x-12
Problem 2: x^6 - x^4 - x^2 + 1? Solve the laplace transform y"- 2y '+ y = e^-t , y(0)=0, y'(0)=1? Would a star cluster with medium-mass protostars be more likely to also have red dwarfs or white dwarfs at the same time? Calculate the solubility of MnS in water?