Personal Savings Rate The personal savings rate for Americans for certain years from 1960 to 2006 can be modeled by the equation
y = −0.008x2 + 0.21x + 7.04
where x is the number of years after 1960 and y is the rate as a percent. Use graphical or numerical methods to find the years from 1960 on during which the model indicates that the personal savings rate was above 4%.
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