Question

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?

Answer 1

Ok. This is just a long multiplication.
How many minutes in an hour?

Answer 2

60

Answer 3

How many hours in a day?

Answer 4

24

Answer 5

How many days in year?

Answer 6

365.25

Answer 7

\(80 ~years \times \dfrac{365.25~days}{year} \times \dfrac{24~hours}{day} \times \dfrac{60~minutes}{hour} \times \dfrac{60~beats}{minute}\)

Answer 8

I got 252,460,800

Answer 9

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.

Answer 10

I get 2,524,608,000

Answer 11

I must of did something wrong

Answer 12

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

Answer 13

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

Answer 14

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
\[10^{9}\]

Answer 15

@mathstudent55

Answer 16

Ok. Now you need the average value as a number in scientific notation.

Answer 17

We get an average value of 2,945,376,000.
You can round this off to 3,000,000,000 (3 billion).

Answer 18

3,000,000,000 = 3 * 1,000,000,000

Answer 19

1 = 10^0
10 = 10^1
100 = 10^2
1000 = 10^3
10,000 = 10^4
etc.
1,000,000,000 = 10^9

Answer 20

3,000,000,000
= 3 * 1,000,000,000
= 3 * 10^9

Answer 21

So is it D

Answer 22

yes

Answer 23

Yay!!!!

Answer 24

Thank you

Answer 25

yw