Posted by **Phillip** on Sunday, March 7, 2010 at 8:01pm.

Hello,

I'm trying to figure out how to do this problem, but don't know where to begin. I think some information is missing.

Blood Pressure:

The function P=120+30Sin 2pi(t) models the blood pressure (in millimeters of mercury) for a person who has a high blood pressure of 150/90; t represents seconds.

a. What is the pressure of this function?

b. How many heartbeats are there each minute?

- Precalc Repost -
**Damon**, Sunday, March 7, 2010 at 8:17pm
Well, that is the pressure

120+30 = 150 maximum

120 - 30 = 90 minimuum

look at that sin function

at t = 0, it is 30 sin 0 = 0

at t = 1, it is sin 2 pi = 0, a full period

so a period is one second

so there are 60 periods per minute

- Precalc Repost -
**Reiny**, Sunday, March 7, 2010 at 8:18pm
a) sub any time t to find the pressure at that moment.

b) the difference of time between a high pressure moment and the next high pressure moment would be one heartbeat.

so find the period of the function, which is 2pi/2pi = 1 sec

so there are 60 heartbeats per minute

- Precalc Repost -
**Maytas**, Wednesday, October 19, 2011 at 11:15pm
The function P(t) = 120 + 30 sin (2πt) models the blood pressure (in millimeters of mercury) for a

person who has a blood pressure of 150/90 (which is high); t represents seconds. What is the period of

this function?

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