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The Stabilization Ratio (births/deaths) for South and Central America

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The stabilization ratio (births/deaths) for South and Central America can be modeled by the formula y = -0.0012x^2 + 0.074x + 2.69 where y is the number of births divided by the number of deaths in the year 1950 + x

a) use a graph to estimate the year in which the stabilization ratio was at its maximum.
b) use the formula to find the year in which the stabilization ratio was at its maximum
c) what was the maximum stabilization ratio from part (b)?
d) what is the significance of a stabilization ratio of 1 ?

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a. I have plotted the graph in Excel. It was found that the year in which the ratio was at ...

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