If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

Main content

Course: Integrated math 3 > Unit 9

Lesson 2: Interpreting features of functions
Math
Integrated math 3
Modeling
Interpreting features of functions
© 2024 Khan AcademyTerms of usePrivacy PolicyCookie Notice

Periodicity of algebraic models

Google Classroom

Problem

A doctor observes the electrical activity of the heart of a patient over a period of time.
The graph below shows the electrical activity, E, in volts, of the patient's heart over time t, measured in seconds. Each spike corresponds to one heart beat.
Approximately how much time is between this patient's heartbeats?
  • Your answer should be
  • an integer, like 6
  • a simplified proper fraction, like 3/5
  • a simplified improper fraction, like 7/4
  • a mixed number, like 1 3/4
  • an exact decimal, like 0.75
  • a multiple of pi, like 12 pi or 2/3 pi
seconds