- Simplify (4x-x^2)^2?

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If water has a [H+] =1x10^-7 M,how is it possible to, by adding a base to the water to decrease This concentration.(In terms of equilibrium)? What is the equation in standar form of a perpendicular line that passes through (5,-1)? And what is the x-intercept of the perpendicular? What volume would 43.5g of CH4 gas occupy at 5.25atm and 45 degree celsius? What is the lost percent when 10 kg of rice is sold for the cost of 8 kg of rice?
Along with process.? How do astronomers use spectrographs to identify the composition and movement of a star?