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 = 0.004 y 2 − 0.02 y + 118 gives a person's blood pressure, P , at age y years
B.) If a person's systolic pressure is 123.6 mm Hg, what is their age (rounded to the nearest whole year)?