A typical healthy person's blood pressure can be modeled by the periodic function below, where t is time (in seconds) and f(t) is in millimeters of mercury. Which one of 0.5, 0.8, or 1 appears to be the period of this function?

f(t) = 26cos(2.5π t)+91

Question

A typical healthy person's blood pressure can be modeled by the periodic function below, where t is time (in seconds) and f(t) is in millimeters of mercury. Which one of 0.5, 0.8, or 1 appears to be the period of this function?

f(t) = 26cos(2.5π t)+91

anonymous · Answer

I think 2.5 it's not frequency, it's angular velocity, as f(x)=Acos(wt) so it'd be 2*pi*f=w;
f=w/2*pi ; f=2.5*pi/2*pi=1.25 and T=1/f so T=0.8 (s)

anonymous · Answer

I'm still lost and already got the problem wrong, but 0.8 was the correct answer.

anonymous · Answer

Got it wrong before putting this up here, I mean.  I just wanted to know how to do it.

anonymous · Answer

so, what's the problem?

anonymous · Answer

tell me so I can helpl you

anonymous · Answer

Where did you get f in 2πf=w?

anonymous · Answer

Oh, wait, that's frequency, huh?

anonymous · Answer

f is frequency

anonymous · Answer

Ok, I get it.  I just needed to read it about 3 times.

anonymous · Answer

thank you!

anonymous · Answer

sure? ok, yw. If you have more questions, just ask

anonymous · Answer

Will do!