The amount of a radioactive substance present, in grams, at time t in months is given by the formula y = 7000(2)^-0.3t Find the number of grams present in 2 years. If necessary, round to three decimal places

a.   since the profit made in 2012 is equal to the profit made in 2014, the profit is symmetric about the line y = 120,000.

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i really dont know

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points a and b are equidistant from the desired line, so the line you find by using them will go through point r.

using points other than a and b will give the desired line only if they are equidistant from r. if they are randomly located, the perpendicular line you create will not necessarily go through point r, hence will not be a solution to the problem.

no because mercury has a density of 13.6 grams per centimeter squared while gold has 19.32 grams centimeter squared

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