- What changes between isotopes?

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How many women to men ratio? Identify the intervals where f(x)=1/3x^3 -2x^2-21x is both decreasing and concave up? If you take enough pills and go to sleep will you die your sleep or will your body force you to wake up? How many days do nurses have off? Find the equation of the line through (7, -4) which is perpendicular to y=2.5?