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anonymous

  • one year ago

The typical healthy resting heart rate in adults is 60–80 beats per minute. If you live 80 years, how many times will your heart beat?

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  1. mathstudent55
    • one year ago
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    Ok. This is just a long multiplication. How many minutes in an hour?

  2. anonymous
    • one year ago
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    60

  3. mathstudent55
    • one year ago
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    How many hours in a day?

  4. anonymous
    • one year ago
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    24

  5. mathstudent55
    • one year ago
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    How many days in year?

  6. mathstudent55
    • one year ago
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    365.25

  7. mathstudent55
    • one year ago
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    \(80 ~years \times \dfrac{365.25~days}{year} \times \dfrac{24~hours}{day} \times \dfrac{60~minutes}{hour} \times \dfrac{60~beats}{minute}\)

  8. anonymous
    • one year ago
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    I got 252,460,800

  9. mathstudent55
    • one year ago
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    Multiply it out with 60 at the end as written above. Then do it also with 80 at the end. Then you can answer the range is from _____ to _____. Alternatively, you can calculate it once with 70 at the end.

  10. mathstudent55
    • one year ago
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    I get 2,524,608,000

  11. anonymous
    • one year ago
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    I must of did something wrong

  12. mathstudent55
    • one year ago
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    Your result is 10 times smaller than it would be. Maybe you entered one of the 60's as just 6.

  13. mathstudent55
    • one year ago
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    60 beats per minute: 2,524,608,000 80 beats per minute: 3,366,144,000 You can answer approx. 2.5 billion to 3.4 billion Using the average, 70 beats per minute: 2,945,376,000 Approx. 2.9 billion

  14. anonymous
    • one year ago
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    So how do i put that into one of these answers because these are the choices a)3 \[10^{6}\] b)3 \[10^{15}\] c)3 \[10^{12}\] d)3 \[10^{9}\]

  15. anonymous
    • one year ago
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    @mathstudent55

  16. mathstudent55
    • one year ago
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    Ok. Now you need the average value as a number in scientific notation.

  17. mathstudent55
    • one year ago
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    We get an average value of 2,945,376,000. You can round this off to 3,000,000,000 (3 billion).

  18. mathstudent55
    • one year ago
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    3,000,000,000 = 3 * 1,000,000,000

  19. mathstudent55
    • one year ago
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    1 = 10^0 10 = 10^1 100 = 10^2 1000 = 10^3 10,000 = 10^4 etc. 1,000,000,000 = 10^9

  20. mathstudent55
    • one year ago
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    3,000,000,000 = 3 * 1,000,000,000 = 3 * 10^9

  21. anonymous
    • one year ago
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    So is it D

  22. mathstudent55
    • one year ago
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    yes

  23. anonymous
    • one year ago
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    Yay!!!!

  24. anonymous
    • one year ago
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    Thank you

  25. mathstudent55
    • one year ago
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    yw

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