anonymous
  • anonymous
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?
Mathematics
jamiebookeater
  • jamiebookeater
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mathstudent55
  • mathstudent55
Ok. This is just a long multiplication. How many minutes in an hour?
anonymous
  • anonymous
60
mathstudent55
  • mathstudent55
How many hours in a day?

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anonymous
  • anonymous
24
mathstudent55
  • mathstudent55
How many days in year?
mathstudent55
  • mathstudent55
365.25
mathstudent55
  • mathstudent55
\(80 ~years \times \dfrac{365.25~days}{year} \times \dfrac{24~hours}{day} \times \dfrac{60~minutes}{hour} \times \dfrac{60~beats}{minute}\)
anonymous
  • anonymous
I got 252,460,800
mathstudent55
  • mathstudent55
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.
mathstudent55
  • mathstudent55
I get 2,524,608,000
anonymous
  • anonymous
I must of did something wrong
mathstudent55
  • mathstudent55
Your result is 10 times smaller than it would be. Maybe you entered one of the 60's as just 6.
mathstudent55
  • mathstudent55
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
anonymous
  • anonymous
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 \[10^{9}\]
anonymous
  • anonymous
mathstudent55
  • mathstudent55
Ok. Now you need the average value as a number in scientific notation.
mathstudent55
  • mathstudent55
We get an average value of 2,945,376,000. You can round this off to 3,000,000,000 (3 billion).
mathstudent55
  • mathstudent55
3,000,000,000 = 3 * 1,000,000,000
mathstudent55
  • mathstudent55
1 = 10^0 10 = 10^1 100 = 10^2 1000 = 10^3 10,000 = 10^4 etc. 1,000,000,000 = 10^9
mathstudent55
  • mathstudent55
3,000,000,000 = 3 * 1,000,000,000 = 3 * 10^9
anonymous
  • anonymous
So is it D
mathstudent55
  • mathstudent55
yes
anonymous
  • anonymous
Yay!!!!
anonymous
  • anonymous
Thank you
mathstudent55
  • mathstudent55
yw

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