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A person's systolic blood pressure, which is measured in millimeters of mercury ( mm Hg ) , depends on a person's age, in years. The

A person's systolic blood pressure, which is measured in millimeters of mercury (mm Hg), depends on a person's age, in years. The equation:
P=0.005y2-0.01y+118
gives a person's blood pressure, P, at age y years.
A.) Find the systolic pressure, to the nearest tenth of a millimeter, for a person of age 50 years.
B.) If a person's systolic pressure is 128.58 mm Hg, what is their age (rounded to the nearest whole year)?

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