Question 1016995
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P=0.007y^2-0.03y+122
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 A.) Find the systolic pressure, to the nearest tenth of a millimeter, for a person of age 40 years.
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Replace y with 40 and solve for P.
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P=0.007(40^2)-0.03(40)+122
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 B.) If a person's systolic pressure is 132.54 mm Hg, what is their age (rounded to the nearest single year)?
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Replace P with 132.54 and solve for y:
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P=0.007y^2-0.03y+122
132.54=0.007y^2-0.03y+122 . Subtract 132.54 from each side.
0=0.007y^2+0.03y-10.54 . Multiply each side by 1000.
0=7y^2+30y-10540 . 
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*[invoke quadratic "y", 7, 30, -10540 ]
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Since negative age does not work, the person's age is 36.7 years.
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ANSWER B: The person is 37 years old.
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