Sugar dissolves in water at a rate proportional to the amount still undissolved. If there were 70 kg of sugar present initially, and at the end of 4 hours only 30 kg is left, how many more hours will it take until 80 percent of the sugar is dissolved?

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A: As per guidelines we are supposed to answer the first questions only.kindly post another questions…

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A: 31. 54% as decimal  54%=54100=0.54 54% in decimal is 0.54

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A: Optimization problem

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A: True....I attach the explanation...I hope it will help you...

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Q: Evaluate J by means of trapezoidal rule using n = 20. Round off your answer to the nearest ten…

A: The final answer(rounded to ten thousand decimal places) is=0.7467