7πt 3 (9) Several research papers use a sinusoidal graph to model blood pressure. Suppose an indi- vidual's blood pressure is modeled by the function P(t) = 30 sin + 130 where the maximum value of P is the systolic pressure, which is the pressure when the heart contracts (beats), the minimum value is the diastolic pressure, and t is time, in seconds. The heart rate is the number of beats per minute. (a) What is the individual's systolic pressure? (b) What is the individual's diastolic pressure? (c) What is the individual's heart rate?

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